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Advanced Review
Re-framing the climate change
debate in the livestock sector:
mitigation and adaptation options
M.G. Rivera-Ferre,*F. López-i-Gelats, M. Howden, P. Smith, J.F. Morton and M. Herrero
Edited by Louis Lebel, Domain Editor, and Mike Hulme, Editor-in-Chief
Livestock play a key role in the climate change debate. As with crop-based agri-
culture, the sector is both a net greenhouse gas emitter and vulnerable to climate
change. At the same time, it is an essential food source for millions of people
worldwide, with other functions apart from food security such as savings and
insurance. By comparison with crop-based agriculture, the interactions of live-
stock and climate change have been much less studied. The debate around live-
stock is confusing due to the coexistence of multiple livestock farming systems
with differing functions for humans, greenhouse gas (GHG) emission profiles
and different characteristics and boundary issues in their measurement, which
are often pooled together. Consequently, the diversity of livestock farming sys-
tems and their functions to human systems are poorly represented and the role
of the livestock sector in the climate change debate has not been adequately
addressed. In this article, building upon the Intergovernmental Panel on Climate
Change Fifth Assessment Report (IPCC 5AR) findings, we review recent litera-
ture on livestock and climate change so as better to include this diversity in the
adaptation and mitigation debate around livestock systems. For comparative pur-
poses we use the same categories of managerial, technical, behavioral and
policy-related action to organize both mitigation and adaptation options. We
conclude that different livestock systems provide different functions to different
human systems and require different strategies, so they cannot readily be pooled
together. We also observe that, for the different livestock systems, several win-
win strategies exist that effectively tackle both mitigation and adaptation options
as well as food security. © 2016 Wiley Periodicals, Inc.
How to cite this article:
WIREs Clim Change 2016. doi: 10.1002/wcc.421
INTRODUCTION
The Intergovernmental Panel on Climate Change
(IPCC) Fifth Assessment Report deals with the
role of livestock in delivering food security in future
food systems and sustainable livelihoods (through its
Working Group 2 on Impacts, Adaptation and Vul-
nerability), and in the degree that it contributes to cli-
mate change via net emissions (through its Working
Group 3 on Mitigation). Livestock farming and cli-
mate change interact in several domains: livestock
emit greenhouse gases (GHGs), farming practices can
also contribute to GHG sequestration, livestock
farming can generate products that substitute for fos-
sil fuels, and livestock systems are impacted by cli-
mate change, are vulnerable to it and will need to
adapt to it, all to different degrees. However, the
*Correspondence to: martaguadalupe.rivera@uvic.cat
Chair of Agroecology and Food Systems, Faculty of Sciences and
Technology, University of Vic-Central University of Catalonia,
Barcelona, Spain
Conflict of interest: The authors have declared no conflicts of inter-
est for this article.
© 2016 Wil e y Pe r i o d icals , In c .
IPCC Fifth Assessment clearly states that the different
intersections of climate change with livestock sys-
tems, despite being crucial, are still relatively under-
studied research areas.
1
Agreement exists on the multiple functions of
livestock in different contexts. The livestock sector
plays a crucial role in global food security, supplying
between 13% and 17% of calories and between
28% and 33% of protein consumption, globally.
2,3
Livestock farming in developing countries, especially
that of small-scale farmers, is characterized by the
provision of multiple benefits, such as improving live-
lihoods for the rural poor, being a source of direct
nutrition, draught power, fertilization, household
fuel, fibre, wealth storage, social status, cultural iden-
tity, control of insects and weeds, and as a buffer
against crop failure.
4–8
The benefits of animal-
sourced protein to poor people are particularly
relevant.
9–12
In industrialized countries by contrast,
livestock production is more likely to be carried out
by large-scale enterprises structured to produce single
commodities, generally meat or milk.
The supply of goods and services provided by
livestock has been accompanied by the ongoing use
and in some cases degradation of natural resources.
It is estimated that 26% of the world’s ice-free terres-
trial area is devoted to pasture and 33% of cropland
is used for feed crop production.
5
The livestock sec-
tor accounts for 80% of the agricultural land
13
and
8% of human water use, mostly for irrigation of feed
crops.
14
Also, humans appropriate 24% of world’s
potential net primary productivity
15
of which 58% is
devoted to livestock farming.
16
This high level of
global activity is particularly reflected in high levels
of GHG emissions. A total of 80% of the agricultural
non-CO
2
emissions are due to livestock
17
while the
livestock sector has been estimated to contribute
between 9 and 25% of anthropogenic
emissions.
13,18–23
Assuming that GHG emissions are
expected to increase worldwide in the years to
come,
18,24
it is of crucial importance to examine
under what conditions the livestock sector can best
contribute to reduce net emissions. In addition, we
need to consider that the livestock sector is vulnera-
ble to climate changes and will need to adapt to
them. In examples of vulnerable human groups in
rural areas highlighted in IPCC AR5 WGII, two were
livestock dependent—pastoralists and mountain
farmers.
25
Potential adaptation strategies have been
identified, but even if fully implemented, there is
likely to be considerable residual vulnerability and so
further adaptations will need to be developed.
Thus, the livestock sector will be bound up in a
nexus of augmented shocks and uncertainties, and
acts both as a driver and recipient of these, with
uncertain implications. Responses to these reflect
sometimes polarised value systems (e.g., in relation
to meat consumption), leading to significant public
debates as to the best pathway forward (e.g., Refs
26,27). This is made more complex by the coexist-
ence of multiple systems of livestock farming with
differing GHG emissions and different characteristics
and boundary issues in their measurement, which,
however, are often pooled together. Consequently,
the diversity of livestock farming systems is poorly
represented and the role of the livestock sector in the
climate change debate has not been adequately
addressed, which is a major omission since distinct
livestock systems involve diverse interactions
between livestock, population, climate and natural
resources.
A large body of work
28–33
already notes the
importance of differentiating between livestock pro-
duction systems, suggesting that this differentiation is
a necessity in the evaluation of different technology
and policy options. It is important to consider that
the existence of different livestock systems is the out-
come of the different functions played by livestock in
different human systems in a variety of contexts. For
instance, large industrial systems are in play in the
United States because the function of livestock pro-
duction is mainly as a competitive corporate business
activity, and there is little demand today for livestock
in the United States to play the same role as they do
in Africa (as repositories of savings, providers of
unspoiled milk to the family, a source of income in
the non-cropping season, etc.). It is important to con-
sider this in addressing strategies for action in differ-
ent regions.
In order to illustrate the need to consider the
existing diversity of livestock farming systems and
shed light on the interactions between climate
change, livestock and human systems, we employ the
broad classification proposed by Thornton et al.
28
and Kurska et al.,
29
based on Seré and Steinfeld.
34
This classification system has been used widely for
poverty mapping
28
; animal health targeting
35
; cli-
mate change impacts and vulnerability
30,36
; and the
assessment of environmental impacts
22,32,37–41
amongst others.
33
It comprises three general types of
livestock system, namely: grazing, mixed crop-live-
stock, and industrial systems (Table 1). Even though
these systems grossly simplify the existing diversity,
the use of this accepted classification allows us to
maximize data availability and reframe recent find-
ings. We will show in this paper that distinctions
between the systems entail radically different interac-
tions with people and climate change.
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© 2016 Wil e y Pe r i o d i cals, Inc .
TABLE 1 |Characterization of Livestock Farming Systems
Grazing System Mixed Crop-Livestock System Industrial System
People Pastoralism engages 120/190
million people
42,43
Involves ~2/3 of the world
population. Main system for
smallholder farmers in
developing countries
44
Relatively small numbers of
people, often highly skilled
Purpose Traditional grazing systems are
sources of food, income, waste
recycling, fibre, lending, status,
social and cultural identity, and
insurance against hard times.
Large-scale private ranching
systems are geared to extensive
meat production for sale.
Source of food, income,
fertilization and manure, and
draught power.
Source of food, income. 90% of
the value of livestock
attributed to marketed
outputs
45
Modalities •Mobile systems on communal
grasslands
•Sedentary systems on
communal grasslands
•Ranching and grassland farming
•Mixed, communal grazing
•Mixed, crop residues
•Mixed, cut and carry
•Mixed, feed from farm
•Mixed, external feed
•Intensive poultry production
•Intensive pig production
•Ruminant feedlot meat
production
•Large-scale dairy production
often in grain-producing regions
or near to urban centers
Location In lands that are too wet, dry,
mountainous, distant or stony
for cultivation, and where
grassland and fodder production
sustain large herds. In Arid,
Semi-Arid, Sub-Humid zones and
Temperate and Tropical
Highlands
Near sources of crops and by-
products.
In nearly all Agro Ecological Zones:
from rainforests to oases in arid
zones.
Often near large urban centers or
transport systems. More or less
independent of the agro-
ecological zone, of special
relevance in Europe, North
America, and some parts of
Latin America, the Near East,
and East and Southeast Asia
Feed Source Dependent on the natural
productivity of grasslands.
Convert human-inedible forage
and rangelands into edible
animal source food.
Use of crop residues and
permanent crop cultivation.
Scarce reliance on external feed
(if any). Convert human-inedible
self-produced residues into
edible animal source food.
Concentrated animal feeding
operations. Depend on external
feed (grains, industrial by-
products). Can convert human-
edible purchased products into
edible animal source food.
Human edible protein
Output/ Input
Some examples: Kenya, 21.16;
Mongolia, 14.60
3
An example: New Zealand, 10.06
3
Some examples: Brazil, 1.17;
Germany, 0.62; USA, 0.53
3
Land and tenure Rangelands including communal
and open-access grasslands. Low
infrastructure.
Communal and private high-quality
grasslands and fodder crops and
crop residues. Moderate
infrastructure.
Relatively small areas. Large
infrastructure development.
Input nature Little or minimal dependence from
purchased feed and external
inputs. In usual conditions, 0 kg
of external feed per kg of
meat.
46
12,000 l of water per kg of edible
beef in ranching
14
Dependent on system and land
tenure.
Inputs range from small to
significant.
42 l water per pig/day (drinking
and service)
46
Dependent on purchased
feedstuffs. Estimate 8 kg of
feed per kg of beef, 4 kg for
pork, 1 kg for broiler
46
53,200 l of water per kg of edible
beef.
14
142 l water pig/ day
(drinking and service)
46
World food production 24% beef, 32% sheep & goat
meat, 1% pork, 2% poultry
meat and 1% of eggs.
32
Provides 9% global meat
47
69% milk & 61% of meat from
ruminants,
40
38% of eggs.
32
Provides 54% global meat.
47
Provides 76% pork & 79% of
poultry meat,
40
61% eggs, 6%
beef, 1% of sheep & goat
meat
32
Genetic diversity 86% (6536) and 7% (523) of the 7616 recorded breeds are local and
regional transboundary breeds, respectively
45
7% (557) of the breeds are
international transboundary
45
WIREs Climate Change Mitigation and adaptation options in the livestock sector
© 2016 Wil e y Pe r i o d icals , In c .
LIVESTOCK SYSTEMS AND CLIMATE
CHANGE MITIGATION
Livestock and GHG Emission Metrics
The livestock sector contributes to GHG emissions
through the emission of methane (CH
4
), largely from
enteric fermentation; nitrous oxide (N
2
O), from
manure and the use of nitrogenous fertilizers in
growing feed; and carbon dioxide (CO
2
), from fossil
fuel burning, land use change driven by agricultural
expansion and reductions in soil carbon in some cir-
cumstances. Estimates of the GHG emissions from
livestock differ according to the system boundaries
established for calculation. Emissions can be classi-
fied as direct, if they are produced on- farm by the
animal (e.g., enteric fermentation), or during the
rearing process (e.g., manure), and indirect, if they
are produced pre-farm by associated industries
(e.g., nitrogenous fertilizers in growing feed or associ-
ated land use changes). The range of estimates of
global GHG emissions attributable to livestock is
large, ranging from 9 to 25% of total
emissions,
13,18–23
with differences mainly due to dif-
ferent calculation methods and whether or not indi-
rect emissions are considered in the equations. In
presenting emissions we also need to differentiate
between absolute and efficiency measures as these
can lead to different outcomes. For example, a live-
stock system might improve its efficiency parameter
(e.g., emissions per unit product), even though its
absolute parameter (total emissions) increases. Abso-
lute emission metrics are important in terms of
addressing the global commons issue of mitigating
GHG emissions whereas efficiency metrics are most
relevant to financial and other livestock system per-
formance measures.
The most common method to determine GHG
emission relates to the volume of CO
2
-equivalents
which integrates the effects of the multiple green-
house gases which may be produced (or removed)
by livestock systems (e.g., Ref 48). This absolute
measure is fundamental to setting emission limits
and emission-reduction goals for the UNFCCC and
national policies, as it links livestock activities to the
change in composition and function of the atmos-
phere. But other efficiency-based or rate metrics
exist, which can be used to plot pathways to effi-
cient and/or equitable achievement of these goals.
These include emissions per hectare, per unit value
or per unit livestock product
19,49
or per unit of pro-
tein.
50
When expressed in these efficiency terms
(e.g., GHG per edible output), the confined opera-
tions of industrial livestock systems can appear to
directly emit less than grazing and mixed systems,
and intensive grazing less than extensive grazing.
51
In contrast, when the method of calculation takes
into consideration the direct and indirect amounts
of resources used as inputs by the livestock system
(e.g., land, kg of fossil fuels), mixed systems,
through livestock and cropland integration, and
extensive grazing systems, through moving the herd
opportunistically and benefiting from the natural
productivity of grasslands, can show smaller GHG
emissions than the confined and sedentary opera-
tions of ‘industrial’livestock systems.
52
The different
metrics employed therefore affect the outcome of the
analysis and the GHG emission responsibility attrib-
uted to diverse livestock systems and thus, they pro-
vide different data to inform policy-makers and the
broader pubic debate.
Nonetheless, several general omissions are iden-
tified in the literature. Firstly, to give the clearest pic-
ture, the measurement of the GHG emissions should
relate to the whole life cycle of the livestock product,
including the feed footprint, since obviously emis-
sions occur throughout the production and distribu-
tion phases of feed inputs.
23,27,53
Secondly, not only
the quantity but also the quality of the resources used
by livestock farming should be integrated into the
calculation. The same quantity of GHG emissions
from using human-edible grain to feed the animals,
or from wastes and pastures of marginal lands,
should be accounted for in a consistent way but dif-
ferentiated so as to deal with it explicitly in nutrition
security policy design and implementation. Also,
other environmental and social costs and benefits can
be included in the calculation, such as the value of
the non-monetized economic activities, the subsist-
ence function of grazing and mixed systems, which
provide valuable nutrition to the poor as well as of
unique livelihood in areas characterized by pastoral-
ism and extensive grazing where a lack of alternative
livelihood opportunities exist, and the value of pre-
serving the health of ecosystems.
54,55
According to
Ripoll-Bosch et al.
56
when accounting for the multi-
functionality of livestock systems, considering
multiple-outputs and allocating the GHG emissions
to the diverse outputs on their relative economic
value, grazing systems emit less GHG emissions per
unit of livestock product (CO
2
-eq/kg of lamb live
weight in that case) than mixed-grazing systems, and
those in turn have lower emissions than industrial
systems. There are additional grounds for speculation
over whether grazing areas without domestic live-
stock might be repopulated with methane-producing
wild ungulates.
52,57
A useful change would be to see
GHG mitigation as one variable in considering policy
and management in changes to livestock systems.
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Livestock and Mitigation Potential
The main strategies described to reduce GHG emis-
sion and to increase GHG sequestration by the live-
stock sector can be divided into supply- and demand-
side strategies. While the former have been better
studied than the latter
58
clearly no measure in isola-
tion will encompass the full emission reduction
potential (e.g., Ref 27). Instead, a combination will
be required, selected from the full range of existing
options, as adapted to different livestock systems and
their functions according to geographical, social and
institutional contexts. In this article, we sub-divide
supply and demand-driven mitigation strategies into
managerial, technological, policy-related and behav-
ioral (Table 2).
SUPPLY-SIDE Mitigation Strategies
Supply-side strategies refer to the actions directly
related to animal production at the farming level.
These include managerial, technological and policy-
related options. Managerial mitigation strategies in
the livestock sector fundamentally comprise
(1) improved energy and nutrient utilization on land,
through management of land, grazing, vegetation,
water, and fire; (2) improved productivity, through
capital and labor intensification; and (3) improved
energy conversion in livestock, through appropriate
breeding, health and feeding, which also include tech-
nological strategies; Policy-related options include
both (4) market mechanisms, through GHG emission
trading systems and GHG footprint labeling (includ-
ing sequestration activities); and (5) enhancing the
production and use of alternative fuels, through recy-
cling livestock waste into biogas.
58–63
Improved Nutrient and Carbon Cycling
on Land
The control of land degradation and deforestation,
and regulating the use of fertilizer inputs for feed
production, are the main issues when dealing with
the enhancing of nutrient cycling on land. Deforesta-
tion prevention is one of the most developed GHG
mitigation policies.
64
Land degradation and deforest-
ation are associated with overgrazing,
65
with conver-
sion of forests into pastures for ranching in grazing
systems,
60
and with land clearing for feed production
in industrial systems.
66,67
Conversion of forests into
croplands and pastures, and grassland degradation,
result in carbon losses which work against any miti-
gation from soil carbon sequestration.
68,69
Soil car-
bon is often lost more rapidly than it is gained.
70
In
fact, deforestation, either to open new pasture or to
create new cropland for feed production, is calcu-
lated to release more CO
2
than any other livestock-
related activity.
60
A total of 4% of anthropogenic
TABLE 2 |Livestock Farming Systems and Climate Change Mitigation
Grazing System Mixed Crop-Livestock System Industrial System
GHG emissions (examples) 27–31 kg of CH
4
per animal per
year in grazing cattle in Africa
and India
46
12% total non-CO
2
emissions
40
53–60 kg of CH
4
per animal per
year in beef & dairy cattle in
USA and Europe; 45–58 kg of
CH
4
per animal per year in
dairy cattle in Africa and
India.
46
77% emissions from
cattle (not all mixed crop-
livestock)
40
117–128 kg of CH
4
per animal
per year in dairy cattle in
USA and Europe
46
10% total non-CO
2
emissions
from monogastric (not all
industrial)
40
GHG emission metrics giving
the most favorable
outcome
Area (kg CO
2
eq/area of land);
resource based (kg CO
2
eq/kg
of fossil fuel based inputs; kg
edible output/quantity of
ecosystem services provided;
kg CO
2
eq. avoided by use of
marginal land).
52
Quantity based (e.g., kg CO
2
eq./
kg food and non-food
goods—leather, wool,
manure, traction, etc.)
52
Quantity based (e.g., kg CO
2
eq/
kg produce)
52
Mitigation assets Grazing responsive to
environmental variation and
low dependence on fossil-fuel-
based practices and external
inputs. Enhanced animal
husbandry, GHG sequestration.
Maintenance of soil fertility, low
dependence on fossil-fuel
based practices and external
inputs. Enhanced animal
husbandry and herd/flock
management, supplements,
feed budgets.
Increased productivity and
efficiency through better
nutrition and genetics,
adjusting the growing
environment, animal health.
WIREs Climate Change Mitigation and adaptation options in the livestock sector
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emissions are attributed to land use change and
deforestation for livestock production.
32
Land and soil management is a key mitigation
strategy
22
since there is twice as much carbon in the
top meter of soil globally as there is in the entire
atmosphere.
71
Soil is one of the largest carbon stores
globally that can be increased through manage-
ment.
62
Grasslands are estimated to store up to 30%
of the world’s soil carbon.
72,73
The carbon sequestra-
tion capacity through soil erosion control and soil
restoration has been estimated to be between 5 and
15% of global emissions.
74
Soil carbon sequestration
potential in global agriculture is estimated to contrib-
ute to 89% of the technical mitigation potential.
59
However, the costs of mitigation substantially limit
that potential, such that economic potentials are only
around one-third of technical mitigation potentials.
59
In both grazing and mixed systems, improved
grassland management and appropriate stocking
density can help to increase soil C stocks.
75
Other
strategies include limiting grazing on seasonally wet
soils and adequate management of irrigation in
pastures.
20,62,76,77
The need to efficiently apply fertilizer inputs is
widely accepted due to the multiple benefits that
accrue. However, this is often driven by an interest in
tailoring fertilizer input with a focus on economic
benefit, rather than for GHG mitigation. Livestock
excreta contain more nutrients than the inorganic fer-
tilizer used annually
32
so consideration of this seems
germane. The separation of livestock from land,
mainly via the livestock housing of industrial sys-
tems, interrupts nutrient flows which triggers soil
organic matter depletion in the location of the food
source, and often pollution at the point of the housed
livestock,
60
while entailing feed production on large
areas of cropland with the associated application of
inorganic fertilizers and GHG emissions. While the
manure from these types of systems deposited on
fields and pastures does not usually generate signifi-
cant amounts of CH
4
,
78
the confined rearing and fee-
dlots of the industrial systems release an estimated
18 million tons of CH
4
annually.
32
To further reduce
in-house emissions of CH
4
and N
2
O in industrial sys-
tems, deep cooling of slurry can be a feasible
option.
79
In addition to this mitigation potential, and
despite the existence of transport, storage and odor
issues, it should also be noted that smallholders can-
not usually afford inorganic fertilizers.
Improved Nutrient and Energy Cycling in
Livestock
The different degrees of inefficiency of animals in
nutrient and feed conversion are the main issues
when tackling improvement of nutrient cycling in
livestock. Both plants and animals are particularly
inefficient in nitrogen uptake.
80,81
Practices to reduce
N
2
O emissions include animal and herd management
to improve energy and nutrient balances, such as:
(1) reducing the number of unproductive animals;
(2) genetic manipulation or animal breeding to
improve the N conversion efficiency in the rumen,
(3) changes in feed quality and composition, and
(4) use of feeding additives, such as condensed tan-
nins, to improve the digestion of amino acids and
reducing N excretion, or salt supplementation to
induce more frequent urination events and thus a
more even spreading of urine across pastures.
20,76,77
Livestock also show differential performance in
feed conversion and associated CH
4
emissions, with
the largest difference between ruminants and mono-
gastrics. Thus, given the higher feed conversion effi-
ciency of monogastrics, some GHG mitigation can be
achieved by shifting production from ruminants to
monogastrics, e.g., chicken, pigs
23,82
or from large to
small ruminants. Additionally, taking into account
the large potential of ruminants to generate CH
4
emissions via enteric fermentation, the following are
specific GHG mitigation measures focused on rumi-
nants: (1) improving forage quality, such as forage
with lower fibre and higher soluble carbohydrates—
changing from C
4
to C
3
grasses; (2) dietary supple-
ments to improve ruminant fibre digestion and pro-
ductivity and reducing methanogenesis, such as
dietary lipids, probiotics, proprionate precursors,
enzymes in the form of cellulases or hemicellulases,
or condensed tannins and saponins; and (3) manipu-
lations of microbial populations in the rumen to
reduce CH
4
production, such as CH
4
inhibitory vac-
cinations against methanogens or chemical defauna-
tion to eliminate rumen protozoa,
83
although these
techniques are still in their infancy or are sub-
economic to use.
20,76,84–87
It must be acknowledged
too the higher potential of ruminants for non-
competition with human food production, since they
are able to utilize non-human-edible feedstuff
(e.g., grass, shrubs), whereas monogastrics often
compete for human-edible food
19
unless they use by-
products or waste products, which makes the com-
parison complex.
Improving Input Capital and Labor
Productivity
Enhancing capital and labor productivity to increase
yields at the same time as reducing GHG emissions
and natural resource use per unit of produce is a goal
that is widely being advocated to tackle both food
security and climate change.
46,88
Several studies
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suggest the potential to improve the environmental
performance of livestock systems can stem from capi-
tal and labor intensification that reduce inputs and
GHG emissions per unit of livestock product.
89
For
instance, in Europe (EU-12) livestock production
increased slightly during the 1990–2002 period,
while CH
4
and N
2
O emissions were reduced by 8%
due to intensification.
90
Similar linkages have been
long-established elsewhere (e.g., Australia
91
). How-
ever, it is also important to consider other trade-offs.
For instance, though it is assumed that the adoption
of more productive breeds will result in the keeping
of fewer animals and reduced GHG emissions, there
may be negative environmental impacts from using
more productive breeds, even in lower numbers, for
example via an increased use of concentrate feeds
rather than the use of crop residues or grazing on
nonarable land.
92
Strategies in this category can be
implemented for all types of livestock system.
Market Mechanisms
Mitigation strategies based on market mechanisms
fundamentally comprise schemes of payment for
environmental services for carbon storage and
sequestration, such as REDD+, the Joint Implementa-
tion or the Clean Development Mechanism under the
United Nations Framework Convention on Climate
Change. These are mechanisms to provide market-
based incentives to manage ecosystems, in this case
livestock systems, to reduce GHG emissions. These
systems can be used to provide monetary alternatives
to GHG emissions. They aim at promoting the pro-
tection of the environment, as well as GHG mitiga-
tion, while alleviating poverty.
93
Institutional factors
are crucial to determine who is involved and who
benefits from these schemes.
94
Some studies show
that these mechanisms can promote GHG mitigation
and improve the livelihood of service providers, via
the provision of institutional frameworks for man-
agement and regulation and through incentives for
behavioral change.
95,96
Critics question the appropri-
ateness of these mechanisms for GHG mitigation in
relation to: the large transaction costs associated with
identifying and working with potential project part-
ners, and ensuring parties accomplish their obliga-
tions that might constrain the participation of the
communities
97
; the existence of unclear property
rights
98
; or the potential alteration of culturally-
based conservation values and land development
aspirations.
93
These critics are linked to the complex-
ity surrounding diverse stakeholders acting at multi-
ple scales, and being exposed to drivers operating
across multiple scales too. The different scales of
demand create a complex market, where small and
large landowners deal with different costs and inter-
ests. For instance, the interests of international busi-
nesses can collide with local communities seeking to
secure food sovereignty.
99
For an effective implemen-
tation of payment for environmental services, it is
thus necessary to understand the local institutional
context in terms of the characteristics of buyers, sell-
ers, and their relationship.
100
It should also be con-
sidered that collecting the required data to calculate
the emissions is unlikely to be feasible for most small-
holders.
101
It is also important to note that in live-
stock systems, informational, cultural and
institutional drivers can substantially affect the bal-
ancing of the grass/forage available with animal
intake, and thus become additional costs or barriers
to the implementation of mitigation strategies for car-
bon sequestration. Specifically in rangelands, the low
sequestration capacity per unit of area, the conse-
quent large monitoring costs, and unclear or commu-
nal land tenure entail costs for carbon sequestration
additional to those derived from assessing technical
feasibility alone.
Given the increasing importance of interna-
tional trade of animal products, which accounted for
22% of total livestock-related carbon emissions in
2004,
102
there is an increasing concern regarding the
trade-offs inherent in these market mechanisms, if
not addressed from a food system perspective. For
instance, industrialized countries promoted the
REDD+ initiative to reduce forest loss in developing
countries, some of which are associated with indirect
GHG emissions allocated to livestock for feed pro-
duction. But as they pay to protect forests, they indi-
rectly drive deforestation via consumption of
livestock.
103
That is, global drivers, such as con-
sumption and international trade, contribute to
deforestation in particular countries, suggesting that
market mechanisms targeting the supply-side need to
be accompanied by market mechanisms targeting the
demand-side if they are to be more efficient, as well
as both coherent and fairer. Other market mechan-
isms linked to demand-side strategies will be dis-
cussed below.
Alternative Fuels
The use of alternative fuels, such as recycling live-
stock waste into biogas by means of anaerobic diges-
ters, is both a policy-related strategy and a
technological strategy, aiming to reduce the climate
impact of livestock from manure management, while
increasing profit and reducing fossil fuel use.
104,105
In industrialized contexts, biogas production through
anaerobic digestion can achieve between 50 and
75% reduction in emissions in manure storage
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systems.
32
In the EU, using manure to produce meth-
ane can potentially reduce 57% of supply chain
energy use in pig farming.
106
At present, only 1% of
global manure is being used to produce biogas.
107
This offers a mitigation opportunity, particularly for
the high-livestock-density operations, which can
reduce GHG emissions while reducing the cost of
waste disposal. Anaerobic digesters, now in use at
some large intensive farms, may not always be eco-
nomically viable for small-scale farms.
108
However,
recovering the methane and using it as an energy
source alternative to wood, charcoal or fossil fuel
could become an option to improve the welfare of
smallholder livestock farmers with co-benefits for soil
fertility and health while favoring GHG mitiga-
tion.
105,109
Flexi-biogas, as developed by IFAD,
could be an option.
110
Oils such as canola and cottonseed can be used
to reduce methane emissions from ruminants (while
also enhancing production) or for conversion into
biofuel (thus substituting for fossil fuels). A recent
analysis of which of these two options is the most
beneficial in terms of GHG emissions across the pro-
duction chain suggests that conversion into biofuel
reduces net GHG most.
63
DEMAND-SIDE Strategies
Although most mitigation strategies focus on supply-
side and technical solutions, the need to focus on the
demand-side is being increasingly recog-
nized.
27,58,62,111,112
That is, if we are to achieve sub-
stantial reduction in GHG emissions in the livestock
sector, we need to address not only how we raise
livestock, but also what, where and how much live-
stock produce is consumed, in order to develop low-
GHG emission diets.
26,27
Demand-side strategies are
more general and do not refer to specific production
systems but rather to consumption options. Thus,
there is a need to take a food systems approach in
order to combine the best mitigation options for dif-
ferent livestock systems in different contexts. At the
same time, it is important to note that, as currently
addressed in the literature, there is more emphasis on
industrialized contexts given the overconsumption of
animal products and their role in driving deforesta-
tion in developing countries. However, we need to
consider that most of the present day and likely
future changes in consumption patterns occur in
developing countries
113
that present completely dif-
ferent issues not well addressed yet. Here, the
increased consumption of animal source foods will
be beneficial to poor people, involving large numbers
of people with very different nutritional issues,
114
so
the scope for such solutions may be limited. The
behavioral modifications of the demand-side mitiga-
tion strategies include dietary choices, such as
(1) reduction in meat consumption, consumption of
animal products with lower net emissions, or a die-
tary shift from meat to plant-based protein
115,116
;
(2) avoidance of food wastage where possible; and
(3) reduction of life cycle emissions. Most of these
mechanisms require supportive policies to facilitate
changes in behavior.
Reduction of Meat Consumption
A number of authors have estimated the mitigation
potential of dietary choices.
117,118
For instance, Popp
et al.
119
estimate a 24% reduction in global soil N
2
O
emissions by 2055, if per capita calorific intake
increases as a function of increases in GDP, but the
share of animal-source foods in this intake is reduced
by 25% every 10 years between 2005 and 2055.
However, while reduction of livestock consumption
may be an acceptable form of mitigation for those in
developed countries, or wealthier people elsewhere, it
may well be deleterious for the poor. Animal-sourced
food offers valuable nutrition for rural poor, both in
protein and in micronutrients, particularly for those
suffering from malnutrition and during periods of cli-
mate stress.
4,10,12
This is why some authors
9,120
sug-
gest that a redistribution of livestock consumption
from food surplus to food deficit regions would trig-
ger coupled health and environmental benefits, as
well as mitigation gains, although the mechanisms to
do this are challenging. To illustrate the potential
benefits associated with a reduction in livestock con-
sumption, Westhoek et al.
121
estimated that halving
the consumption of animal products in the European
Union, which at present consumes 70% more animal
protein than recommended by the WHO, would
deliver a 40% reduction in nitrogen emissions,
25–40% reduction in GHG emissions and 23% per
capita less use of cropland for food production, while
at the same time would lead to a reduction in cardio-
vascular diseases and some cancers. The environmen-
tal, health and food security benefits of healthy diets,
with reduced livestock content, were also emphasized
by Tilman and Clark.
116
In addressing the nutritional
contributions of meat to food security, it must be
considered that grazing animals often provide higher
nutritional quality products than animals raised
industrially.
122,123
Taxes and subsidies to favor
behavioral modification have recently been pro-
posed
124
and in that manner, mitigation through the
promotion of low-emission diets could offer good
opportunities for boosting the role of smallholders in
the mitigation of climate change.
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Food Wastage Reduction
Reduction in food wastage is another behavioral
modification that can trigger mitigation gains, partic-
ularly concerning GHG-intensive foodstuffs.
125,126
In
the United States, food losses contribute 1.4 kg car-
bon dioxide equivalents (CO
2
-eq) per capita per day,
that is, 28% of the overall carbon footprint of the
average U.S. diet.
127
Similarly, the avoidance of food
losses in the consumer phase of milk, poultry meat,
pig meat, sheep meat and potatoes in United King-
dom would reduce annual N
2
O emissions by at least
2GgN
2
O-N per year.
117
Reduction of Life Cycle Emissions
Most strategies in this category look for the reduc-
tion of large travel distances and energy costs of
refrigeration/preservation.
27,46,120,128–130
The consid-
eration of the indirect GHG emissions associated
with grain-based feed production,
131
mostly due to
land use change strongly associated with confined
ruminant and monogastric operations, can neutralize
the difference in GHG emission between monogastric
and ruminant livestock when calculated with only
feed-conversion efficiency. In line with this, some
authors suggest a shift toward the local consumption
of livestock produce from grazing and mixed systems
as a mitigation option.
132
In contrast with the land-
sparing strategy, mixed and grazing systems seek to
integrate cropping and grasslands with livestock,
reducing GHG emissions through a decrease in
nitrogen-fertilizer use and enhancing soil fertility by
partially closing nutrient loops, while local consump-
tion of the livestock produce reduces fossil fuel use
for transport.
133–135
These strategies fit well with the
production conditions of small farmers both in indus-
trialized and developing countries.
Market Mechanisms: Voluntary Standards
and Labeling
Market-based mechanisms on the demand-side can
mitigate GHG through the development of livestock
product standards and labeling, such as the Carbon
Reduction Label in United Kingdom, ClimaTop label
in Switzerland, or the Carbon Label in France. Prod-
uct carbon footprint standards are also being increas-
ingly integrated within labels of organic food, such
as the Swedish label KRAV. Based on the lessons
learned from the development of organic farming, it
is suggested that GHG footprint labeling might
become a good option for the benefit of smallholders
in developed countries.
135
Besides the issue of calcu-
lating the emissions, which is likely to be difficult
particularly for smallholders and developing
countries, there are not only technological issues to
be overcome, but also equity and social justice issues
between industrialized and impoverished
countries.
136
IMPACTS, VULNERABILITY AND
ADAPTATION OF LIVESTOCK
SYSTEMS TO CLIMATE CHANGE:
THE HUMAN DIMENSION
Climate-change impacts, vulnerability and adaptation
options of the livestock sector are multiple, varied
and complex
137,138
but in the IPCC 5AR Working
Group 2 they were under-represented when com-
pared with cropping systems (Figure 1). In large part,
this reflects the relativities of the size of the literature
on livestock and climate versus the expansive litera-
ture on crops, but it also reflects the lack at the time
of global livestock modeling analyses which are only
now coming available (e.g., Ref 22) and the paucity
of synthetic reviews of the issue. Addressing the
impacts, vulnerability and potential adaptation
capacity of diverse livestock systems is an important
part of global analysis of the risks of climate changes.
For instance, grazing and mixed systems involve
large numbers of poor people and people at risk of
poverty worldwide (Table 1), for whom livestock
production accounts directly or indirectly for a signif-
icant share of household income and consumption,
and for whom there are often no practical alternative
livelihoods.
139
Impacts of climate change on these
production systems are likely to therefore have more
severe impacts on more people than impacts on
industrial systems, and possible in these contexts, the
only potential adaptation under climate change is to
raise livestock.
140
Observed and Projected Impacts of
Climate Change on Livestock Systems
Considering the different dimensions of climate
change, impacts can be distinguished between those
related to (1) extreme events, such as floods, storms,
hurricanes, droughts, and heat waves, and (2) the
more gradual changes in the averages of climate-
related variables, such as local temperature, rainfall,
and its seasonality, sea level rise, and higher atmos-
pheric concentrations of CO
2
. Considering causality,
impacts can be grouped as (a) direct impacts on ani-
mals, such as heat and cold stress, water stress, phys-
ical damage during extremes, and (b) indirect
impacts, such as modification in the geographical dis-
tribution of vector-borne diseases, location, quality
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and quantity of feed and water and destruction of
livestock farming infrastructures
141
(Table 3). In
terms of observed and projected impacts in the litera-
ture, they mostly relate to animal feed, whether
through impacts on grassland and pastures, or
impacts via grain-feed production.
138
From a food
systems perspective, other impacts on livestock sys-
tems will affect storage infrastructures (both of ani-
mal feed and animal products, e.g., milk), processing
operations, transport facilities and retailing.
142
In industrial livestock systems, the most impor-
tant impacts are expected to be indirect, leading to
rises in the costs of water, feeding, housing,
143
trans-
port and the destruction of infrastructure due to
extreme events, as well as an increasing volatility of
the price of feedstuff which increases the level of uncer-
tainty in production. Given the high costs involved in
moving the associated infrastructure, climate change
will likely result in increasing effort to isolate the ani-
mals from climate influences. When financial returns
pass below a context-specific threshold, transforma-
tional change via relocation may occur.
144
The most important direct impacts on mixed
livestock systems are linked to increased water and
temperature stress on the animals, while indirect
impacts are mostly the result of impacts on the feed
base, whether pastures or crops, leading to increased
variability and sometimes reductions in availability
and quality of the feed for the animals. Changes
toward breeds with higher heat resistance but lower
productivity potential and to fodder bases which are
more able to cope with difficult climate conditions
may be needed. This may require changes in knowl-
edge base and practice changes. Those mixed systems
which are dependent on external infrastructures, such
as irrigation infrastructure, may be exposed to
increased risk of damage from extreme weather
events.
Extensive grazing systems will be more affected
by those impacts which significantly alter ecosystem
processes, such as changes in the feed base or
increased risk of animal diseases.
145,146
As for
mixed-systems, direct impacts result from water and
temperature stress to the animals potentially leading
400
350
300
250
200
150
100
50
450
0
Food security text Food security figs
etc
Crop
Livestock
40
35
30
25
20
15
10
5
0
SPM text SPM figures
Crop
Livestock
160
140
120
100
80
60
40
20
0
Rural
Europe
North America
South America
Asia
Africa
Australia/NZ
Crop
Livestock
(b)
(a)
(c)
FIGURE 1 |Frequency of appearance of the word and phrases relating to livestock versus cropping systems and their outputs in (a) the
Summary for Policymakers, (b) the Food Security chapter and (c) the regional chapters of the IPPC Fifth Assessment Report.
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to animal morbidity, mortality and distress sales.
Indirect impacts presumably will be more linked to
decreasing or changing rangeland productivity
138
and may entail systemic changes such as moves
toward smaller breeds or species more tolerant of
emerging climate conditions, noting that this often
has cultural dimensions as well as financial and
knowledge investment implications. Although the
effects of CO
2
fertilization on grassland and forage
production and quality need to be better quantified
under conditions of water stress and high tempera-
ture, when considered along with projected climate
changes, in many regions, forage availability and
quality will be reduced and become more variable.
This is likely to lead toward overgrazing and land
degradation if farmers are not able to adjust stocking
rates
147
due to economic or cultural pressures or
relocate or alter seasonal migratory patterns. The
capacity to address the non-climate-related stressors
that threaten the capacity to change is crucial
101
as
shown later, to reduce the vulnerability of these
farming systems.
25
Vulnerability of Livestock Systems to
Climate Change
Different livestock farming systems have clearly dif-
ferentiated vulnerabilities and adaptive capacity to
climate change (Table 4). Following the IPCC WG2,
we highlight here contextual vulnerability, in which
not only climate-related drivers are considered, but
also non-climate drivers, to give a more complete pic-
ture of systems’vulnerability and to understand
adaptation capacities with respect to observed and
projected impacts. Here, we divide these drivers into
internal and external drivers. In general terms, graz-
ing and mixed systems’vulnerabilities derive both
from external and internal drivers, while industrial
systems’vulnerability arise mainly from internal
drivers, particularly the high dependence on
TABLE 3 |Some Direct and Indirect Impacts of Climate Change on Livestock in Different Livestock Systems
Grazing System Mixed Crop-Livestock System Industrial System
Direct
impact
Mean climate
changes
•Chronic temperature stress
•Water stress
•Reduced feed intakes
•Decreased production and
reproduction of livestock
•Chronic temperature stress
•Water stress
•Reduced feed intakes
•Decreased production and
reproduction of livestock
•Decreased production and
reproduction of livestock
Extreme
events
•Temperature stress events
•Livestock mortality and
distress sales
•Temperature stress events
•Lowered productivity
•Increased likelihood and
severity of heat stress events
•Animal morbidity and mortality
•Lowered productivity
Indirect
impact
Mean climate
changes
•Variation of the quality,
quantity, seasonality and
distribution of pasture
•Changes in grass/browse
cover in rangelands
•Increased incidence of
livestock pests and disease
•Change in disease
distributions
•Decreased productivity of
livestock
•Moving to smaller breeds
•Increased conflict in pastoral
regions
•Variation of the quality and quantity
of fodder (stover, pastures)
•Increased incidence of livestock
pests and disease
•Change in disease distributions
•Move to lower productivity but
higher heat stress resistance breeds
•Better conditions for crop weeds
and pests
•Cropping often favored financially
•In dry margins, grazing may
increase overcropping
•Increased cost of animal
housing
•Increased risk of disease
epidemics
•Increased cost of feed and
water
•Moving to lower productivity
but higher heat stress
resistance breeds
•Changing enterprise viability
due to extra costs
•Moving location
Extreme
events
•Pasture shortage
•Increased variability in
ground-cover
•Altered distributions of
livestock vectors
•Soil erosion and vegetation
damage
•Fodder shortage
•Damage to standing feed
•Negative impacts on livestock
managers
•Increased costs through insurance
•Soil erosion
•Destruction of infrastructure
•Increased transport cost
•Increased cost of feed and
water
•Increased volatility of feed
supplies and their price
•Increased costs through
additional insurance
•Destruction of infrastructure
Source: Adapted from Refs 31,138,141.
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fossil-fuel-based and external inputs, the current
narrow livestock gene pool, limitations on waste dis-
posal and constraints on relocation.
141
Grazing systems’external vulnerability mainly
arises from being a remote, often marginal economic
activity with relatively low value in export or eco-
nomic development terms, and a range of constraints
on improvement including the high cost and often
low supply of basic services.
101,148
This and the ‘dis-
tant voice’characteristic of extensive grazing
communities—geographical and political distance
from the decision-makers
149
—tend to limit invest-
ment by government and business. Also, land
encroachment through expansion of crop-only land
use can increase this vulnerability for the livestock
activities. These conditions also result in a lack of
other economic options to the people depending on
these farming systems, further increasing their
vulnerability to climate change. Non-climate stressors
increasing grazing systems’and smallholders’vulner-
ability
8,101
can be grouped into: (1) demographic
growth and rising competition for the use of range-
lands, (2) disregard of traditional knowledge, institu-
tions and customary practices in policy-making, and
(3) increasing but unequal and precarious integration
within the market economy resulting in increased risk
of market failures. For instance, recent findings show
that while efforts to enhance access to markets and
alleviate constraints to mobility may have some posi-
tive effects, further benefits would arise if current
inequities in market development were addressed.
Indeed, poor and middle-income pastoralists are
shown to participate very little in high-value export
trade and thus market-based benefits for them will be
greater in relatively low-value market chains, such as
domestic and cross-border trade.
150
Overall, these
TABLE 4 |Vulnerability of Livestock Farming Systems and Climate Change Adaptation Capacity
Grazing System Mixed Crop-Livestock System Industrial System
Vulnerabilities •Marginalization
•Land encroachment
•Land degradation
•Land fragmentation
•Remoteness
•Lack of financial capital and
alternative economic options
•Limited mobility
•Land degradation
•Land scarcity especially from urban
expansion
•Rising food safety standards
•Population growth
•Economic margins often small and
financial capital often low, resulting in
lock-in
•Economic relativities favoring cropping
•Co-managing price and climate
variability
•Learning and capital demands from
having multiple farm components
•Labor supply for peak periods of activity
•Shrinking farm sizes
•Dependence on fossil-fuel-
based practices, external
inputs and hired labor
•Difficulties in re-locating
•Narrow gene pools in livestock
and input crops
•Challenges in waste disposal
and animal welfare impacting
on social licence to operate
•Susceptibility to disease
outbreaks
•Low economic margins
•Operating close to or at
maximum physiological and
financial limits
Adaptation
capacity
•Mobility to adapt to spatial
climate variability
•Family labor
•Communal land and social
collaboration
•Local knowledge of diverse
resources
•Capacity to add value to
marginal land
•Wide livestock gene pool
•Recycling plant nutrients
•Transformation to mixed
systems
•Off farm income
•Integration of agriculture and livestock
•Capacity to use crop residues
•Often private land, hence have agency
•Flexibility in crop-:livestock allocation
and other decisions
•Diversification
•Family labor
•Wide livestock and forage gene pool
•Recycling plant nutrients
•Flexibility in allocating produce to
subsistence or market
•Off farm income
•Access to global feed and
input supply chains
•Access to credit and modern
technology
•Access to global consumer
market
•Capital mobility and exploiting
economies of scale.
•Control of many aspects of the
system
•Good information systems
(climate, financial, supply)
allowing rapid responses
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drivers are causing gradual dismissal of local knowl-
edge, abandonment of communal planning and insti-
tutions, increase in social differentiation, and over-
exploitation of natural resources.
Mixed systems’vulnerabilities arise from differ-
ent sources. In contrast to grazing systems, the lim-
ited mobility of mixed livestock systems increases
their vulnerability to climate change, which is aug-
mented by the seasonal scarcity of available land to
graze and use for animal feed. External drivers of
vulnerability of mixed livestock systems are linked to
the rise of food safety standards, population growth,
land competition, capital constraints, degradation of
resources and more limited economic opportunities
as compared to cropping options.
60
Adaptation Options
Numerous adaptation strategies in the livestock sec-
tor have been described,
8,55,101,151–154
that could
individually and collectively improve food security
under climate change.
138
For analytical purposes we
focus on adaptation strategies of livestock systems.
Considering that livestock systems have different
functions to different human systems, the nature of
how these systems contribute to livelihoods resilience,
mostly to poor people in developing countries, is of
major importance and needs to be considered.
139
Like mitigation strategies, we classify adapta-
tion options as managerial, technological, policy-
related, and behavioral (Table 5). Managerial
options include (1) production adjustments, such as
intensification, integration of livestock, and crop pro-
duction, altering the timing of the farming practices,
shifting from grazing to browsing species, herd
mobility, soil and nutrient management, water man-
agement, pasture management, control of livestock
(e.g., corralling), feed and food storage including pro-
cessing of animal products (e.g., fermented, salted),
multispecies herds, farm diversification or cooling
systems (e.g., in livestock housing); and (2) alterations
in labor allocation, such as diversifying livelihoods,
shifting to irrigated farming, and labor flexibility.
Technological options include (3) breeding strategies,
such as adoption of high-yield breeds, selecting
breeds with improved feed-conversion efficiency, and
cross-breeding with heat- and disease-tolerant breeds;
(4) information and communication technology
research to provide greater understanding of climate
and livestock interactions, such as fenceless grazing
using GPS or improved short-term weather and sea-
sonal climate forecasts. Policy-related options include
(5) institutional and policy plans, such as schemes of
sedentarization, access to resources to reduce
vulnerability, such as early-warning systems, food
relief and national safety programs, weather-indexed
insurance for impacts of climate extremes or develop-
ment and maintenance of supportive infrastructure
(roads, rail, harbors, storage, processing, etc);
(6) modifications in market integration and wealth
storage, such as supporting different market access,
credit schemes, promotion of interregional trading,
bartering, herd accumulation, food preservation, and
cash and asset management. Behavioral options are
linked to cultural patterns such as (7) boosting social
collaboration and reciprocity, e.g., livestock loans,
friendly collaboration, communal planning, commu-
nal ownership and food exchange; and (8) informa-
tion exchange.
155
Some of these strategies can be considered as
deriving from local traditional knowledge that pro-
motes endogenous adaptation and to be easier to
implement, others require exogenous knowledge and
more inputs to be implemented, but all may have
some utility in different contexts and livestock sys-
tems. Access to technologically-advanced breeding
strategies, cooling systems, insurance, credit or veteri-
nary services, which allow industrial, intensive sys-
tems to reduce the impact of local climate variability,
are beyond the means of most smallholders, particu-
larly in developing countries. In contrast, farmers in
developing countries are highly experienced in man-
aging livestock in marginal situations including man-
aging variable and sometimes extreme climatic
conditions.
101
Their sometimes ambiguous
institutions,
156,157
knowledge, and customary prac-
tices which are often highly adapted to the local con-
ditions and developed over centuries of co-evolution
with changing environments, can be of great value in
adapting the whole livestock sector to changes in cli-
mate means and variability. But adaptation to a vari-
able and changing climate is an ongoing process,
since vulnerabilities and impacts are permanently
evolving, which means that some forms of adapta-
tion that have proved to be appropriate in the past
or at present, may became inappropriate or inade-
quate in the future
138
and vice versa. Also, as previ-
ously mentioned, diverse non-climate-related
stressors can severely hinder the adaptive capacity of
smallholders.
INTEGRATED ADAPTATION
AND MITIGATION OPTIONS
In looking at the potential mitigation and adaptation
strategies discussed in this paper, and facilitated by
the use of the same categories for both, we can
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TABLE 5 |Qualitative Integrated Assessment of Adaptation and Mitigation Strategies and Its Potential Applicability by Livestock Farming
System, Including the Type of Knowledge Associated to Develop the Strategies
Category Sub-category Practices
GRAZING
SYSTEM
MIXED
SYSTEM
INDUSTRIAL
SYSTEM Co-benefits
Knowledge
type
MITIGATION Adaptation
Managerial
Land
management
Avoid deforestation ++ ++ ++ ++ LTK/STK
Control land degradation (soil
erosion, restoration)
++ ++ ++ ++ LTK/STK
Grassland management,
stocking density
++ ++ 0 ++ LTK/STK
Limited grazing on wet soils,
pastures irrigation
management
+ ++ 0 ++ STK
Farm nutrient
cycling
Efficient use of fertilizers for
feed
0 ++ ++ + STK
Organic manure 0 ++ 0 + LTK
Integration livestock-crop ++ 0 + +
Livestock nutrient
cycling
Breeding to improve rumen N
conversion efficiency
++ ++ + + STK
Reducing the number of
unproductive animals
++ ++ 0 ++ LTK
Change species: ruminant to
monogastric; large to small
++ ++ ++ + LTK/STK
Changes in feed quality and
composition
+ ++ ++ ++ LTK/STK
Capital-labour
intensification
Capital intensification 0 + ++ 0 STK
Labour intensification ++ ++ ++ + LTK/STK
Technological
Farm nutrient
cycling
Urease or Nitrification
inhibitors
0 + 0 0 STK
Livestock nutrient
cycling &
reduction of
CH4 emissions
Feeding additives (eg.
condensed tannins)
0 ++ + 0 STK
Salt supplementation ++ ++ 0 + STK
Improving forage quality ++ ++ 0 ++ LTK/ STK
Manipulations of microbial
populations
0 ++ ++ 0 STK
Deep cooling slurry 0 0 ++ 0 STK
Policy-related
Market
mechanisms
Policy schemes (REDD++,
CDM)
++ ++ ++ + P
Alternative fuels Anaerobic digesters 0 0 ++ ++ STK
Flexi-biogas systems ++ ++ 0 ++ STK
Behavioural
(Demand-
driven)
Reduction in meat
consumption
+++ ++ + P
Food waste reduction ++ ++ ++ ++ LTK/STK/P
Reduction of life cycle
emissions (local food,
low energy)
++ ++ +/- ++ LTK/P
Labelling products + + + 0 P
Advanced Review wires.wiley.com/climatechange
© 2016 Wil e y Pe r i o d i cals, Inc .
TABLE 5 |Continued
Category Sub-category Practices
GRAZING
SYSTEM
MIXED
SYSTEM
INDUSTRIAL
SYSTEM Co-benefits
Knowledge
type
ADAPTATION Mitigation
Managerial
Farm
management
Integration crop-livestock ++ 0 0 ++ LTK
Altering timing of farming
practices
++ ++ 0 0 LTK
Shifting species (grazer to
browser) and/or breeds
++ ++ ++ ++ LTK
Herd mobility ++ + - + LTK
Soil management
(composting, crop residues,
legumes)
+ ++ 0 ++ LTK/STK
Water management
(irrigation, traditional
storage, etc.)
++ ++ ++ 0 LTK/STK
Pasture management
(enclosure)
++ ++ 0 ++ LTK/STK
Control of livestock
(corralling)
++ ++ 0 ++ LTK
Feed and food storage ++ ++ ++ 0 LTK/STK
Food processing ++ ++ 0 0 LTK/STK
Multispecies herds + ++ - + LTK
Farm diversification + ++ - + LTK
Cooling system 0 0 ++ - STK
Labour allocation Diversifying livelihoods + ++ - 0 LTK
Shift to irrigated farming -- +/- 0 0 STK
Labour flexibility ++ ++ ++ +
Technological
Livestock
management
Breeding (I): high-yield, good
feed-conversion breeds
+ ++ ++ ++ STK
Breeding (II): Cross-breeding
heat, disease-tolerant breeds
++ ++ + 0 LTK/STK
ICT Weather forecasting ++ ++ ++ 0 LTK/STK
Policy-related
Institutional and
policy plans
Early-warning systems ++ ++ ++ 0 P
Schemes of sedentarization + 0 0 0 P
Weather-indexed insurance/
catastrophic coverage
++ ++ ++ 0 P
Access to resources (land, water) ++ ++ 0 0 P
Food relief, National safety
programs
++ ++ 0 0 P
Market
(integration
and wealth
storage)
Market access (local-regional-
global)
++ ++ ++ ++(local)
--(global)
P
Credit schemes ++ ++ ++ 0 LTK/P
Interregional trading ++ ++ ++ - P
Bartering ++ ++ 0 0 LTK
Herd accumulation ++ ++ 0 - LTK
Food preservation ++ ++ 0 0 LTK/STK
Cash and asset management
(bank savings)
++ ++ ++ 0
WIREs Climate Change Mitigation and adaptation options in the livestock sector
© 2016 Wil e y Pe r i o d icals , In c .
identify integrative solutions that provide potential
win-win strategies for mitigation and adaptation
(and food security) for each livestock system, and
even for the livestock sector in general. Similarly, we
can identify trade-off (or win-lose) situations.
Table 5 qualitatively assess all the mitigation and
adaptation strategies collected in this review for each
category and farming system, including whether they
depend on traditional or/and scientific knowledge,
and whether policy actions are required.
Starting with the strategies described in this
paper classified as having mitigation potential, we
observe that all the strategies under the managerial
category also have adaptation potential, and are suit-
able for at least two of the three farming systems
categories. In general terms, these strategies do not
require high investments, being more dependent on
adequate policy incentives or institutional environ-
ments to facilitate changes in management. Thus,
their overall potential to contribute to both mitiga-
tion and adaptation in all livestock systems is very
high, as well as their potential effectiveness
(Figure 2). From these, land management strategies
offer the greatest options. For instance, avoiding
deforestation is a very important strategy to mitigate
and adapt to climate change, since in adaptation
terms it can also provide other resources (e.g., bush
foods, medicinal plants) to livestock keepers, which
can buffer climate variations via diversification of
income and obtaining other food sources.
158,159
These land management strategies are mainly mana-
gerial and technological and are often intended to
improve the efficiency of livestock systems in a form
of sustainable intensification. Strategies linked to sus-
tainable intensification that consider all the other
objectives (ethical, health, development, social justice,
including concerns around vulnerability and social
equity, biodiversity and land use, animal welfare,
human nutrition and rural economies
139,160
)canoffer
promising outcomes in both adaptation and mitigation
terms. Indeed, sustainable intensification measures in
livestockhavealsobeensuggestedforadaptationpur-
poses.
161
For instance, changing species or breeds, stra-
tegies widely used by grazing and mixed farmers to
adapt to changing conditions, can also aid mitigation
in certain cases. For example, by improving breeds to
obtain more efficient animals and then keeping a lower
number of animals, or by changing to non-ruminants
(e.g., from cattle to camels) which are more efficient in
the use of nutrients. In promoting these strategies, it is
very important to look at the system where they will
be applied with a complex systems perspective, to con-
sider future potential vulnerability and resilience.
139
Finally, we can observe that demand-driven strategies,
linked to changes in behavior, strongly depend on ade-
quate policies to promote these changes.
Mixed-systems appear to present greater oppor-
tunities for mitigation strategies than the other sys-
tems, consistent with the quantitative estimations of
Havlik et al.
22
They showed that transitioning from
grazing to mixed systems contributes to reduced
GHG emissions, mostly through gain in feed and for-
age productivity from more intensive inputs and man-
agement. This is an attractive mitigation opportunity
for reducing CH
4
and N
2
O emissions per unit of live-
stock product, while at the same time increasing pro-
ductivity.
59,162
It is important to note however, that
increased efficiencies by themselves do not necessarily
assist meeting global GHG reduction targets if the
demand for underlying production increases to a
greater extent
27
and where the GHG impacts of the
feed production is included. Additionally, not all graz-
ing systems can shift to mixed systems, since many of
them are located in marginal areas where cropping is
difficult, if not impossible, and in others various con-
straints operate to limit change, with livestock
TABLE 5 |Continued
Category Sub-category Practices
GRAZING
SYSTEM
MIXED
SYSTEM
INDUSTRIAL
SYSTEM Co-benefits
Knowledge
type
ADAPTATION Mitigation
Behavioural
(cultural)
Social
collaboration &
reciprocity
Livestock loans ++ 0 0 0 LTK
Friends-family collaboration ++ ++ 0 0 LTK
Communal planning ++ 0 0 0 LTK
Communal ownership ++ - 0 0 LTK
Food sharing ++ ++ 0 0 LTK
Potential refers to relevance for the specific farming system, or capacity of the system to adopt such a strategy (e.g., poor farmers cannot adopt some expensive
technologies). 0 can indicate a lack of potential or that the strategy is already part of the system (e.g., mixed livestock systems already integrate livestock and
crops). + and ++ indicate greater degrees of potential for application. Type of knowledge: LTK, Local and traditional knowledge; STK, Scientific and techno-
logical knowledge; P, Policy-driven actions.
Advanced Review wires.wiley.com/climatechange
© 2016 Wil e y Pe r i o d i cals, Inc .
currently being the only viable livelihood.
139
A call
for analyzing crop-livestock interactions to increase
resilience to global environmental change, including
responses of these interactions to climate change, has
recently been made.
163
In terms of adaptation, once again managerial stra-
tegies appear to offer the greatest potential to favor both
adaptation and mitigation options, many of which
(e.g., herd mobility or pasture enclosure) need support
from favorable policies and institutions. This suggests a
need to focus more research on the role they can play.
164
In terms of farming systems, both grazing and mixed sys-
tems have the highest number of adaptation options
identified. Industrial systems, as previously stated, have
fewer options, resulting from their high dependence on
external knowledge, and the need to control the system
in order to reduce its internal vulnerability.
If we allocate to each of the described strategies
in this article the type of knowledge (broadly categor-
ized into local and traditional knowledge, and scien-
tific and technological knowledge) required to
support adaptation and mitigation strategies
(Table 5), and which integrated strategies have higher
difficulty or cost in implementation (Figure 2), some
patterns emerge. In general, we observe that adapta-
tion is more related to management of both the inter-
nal and external environment (i.e., market conditions,
input availability, finance options, access to knowledge
and technology, climate, robust institutions, etc.) with
often strong contributions from local and traditional
knowledge, whereas mitigation is more about managing
just the internal operations, bringing in new technology
on an occasional basis, with fewer inputs from local
and traditional knowledge. Across farming systems, we
observe that options for mitigation in industrial live-
stock systems are more dependent on scientificandtech-
nological knowledge, and are facilitated by increased
levels of control within these systems. Policy strategies
are important both in mitigation and adaptation strate-
gies, and more research is needed to further develop the
potential of different policies (e.g., addressing changes in
management and behavior) to both mitigate and adapt
to climate change with a relatively low economic cost.
Finally, our analysis reveals relevant information
in terms of efficiency, that is, which cost or trade-off is
involved in some of the integrated strategies (Figure 2).
Crop-livestock integration, land management and
reduction of meat consumption offer the greatest
advantages as integrated adaptation and mitigation
strategies. But each of them has its specificities. For
example, crop-livestock integration is a highly efficient
strategy with relatively low barriers for implementation
except those explained above. In contrast, the cultural
changes needed for broad scale implementation of die-
tary change, with large impact for mitigation, are rela-
tively difficult in the short-term, but possible if we
Feeding
additives
Genetic
gains
Imigration
Adaptation effectiveness
Herd mobility
Land
management
(deforestation
degradation)
Altering timing
of farming
practices
Far m
diversitification
Change
species
Feed & food
storage
Interregional
trading
Labelling
products
Reduce meat
consumption
Pasture
improvement
Policy schemes
(REDD++, CDM)
Change feed
quality &
composition
Cross-breeding
heat & disease-
tolerant breeds
Friends-family
collaboration
Integration
livestock-crop
g
Grazing
management
n
Weather
forecast
Insurance
Mitigation effectiveness
FIGURE 2 |Effectiveness of different adaptation and mitigation options. The intensity of the color implies the difficulty in implementation or cost
or trade-off involved. Valorization is qualitative: clear gray, easy implementation, low trade-offs; hard gray, difficult implementation, high trade-offs.
WIREs Climate Change Mitigation and adaptation options in the livestock sector
© 2016 Wil e y Pe r i o d icals , In c .
accept that current increasing demand of meat products
is also a policy-driven trend.
111
Clearly, more research
to develop a complex array of behavioral, policy and
technological approaches is needed to facilitate dietary
transition. Land management strategies can be rela-
tively easy to implement, depending on the context,
beingveryefficient in terms of adaptation and mitiga-
tion. These strategies should be high priorities for policy
makers if we consider efficiency and implementation
costs. Figure 2 also indicates that in general, adaptation
strategies seem to be less difficult to implement, or have
fewer barriers and trade-offs than mitigation options. It
is important also to highlight that some strategies are
context-dependent, and this makes them difficult to
evaluate broadly. For instance, inter-regional trading,
which can be a valid adaptation strategy, can have miti-
gation trade-offs given the increasing CO
2
emissions
associated with livestock transport.
CONCLUSIONS
The rapid growth of the livestock sector and demands
for its products has given rise to unexpected and major
implications for the environment and livelihoods, par-
ticularly in relation to climate change. Clearly, drawing
greater distinctions between different livestock systems
is needed. Renewed attention to diversity within the
livestock sector and the multiple objectives it meets are
required to address the increased demand in ways that
contribute to environmental sustainability, poverty
reduction, social equity, food security, and human
health. To meet these requirements, all livestock sys-
tems must improve their performance via combina-
tions of managerial, technological, and policy
responses. Particularly, more research is needed to
assess the potential of managerial strategies to pro-
mote win-win solutions, including their economic
cost and their social outcomes. We identify some
responses that can improve both climate change
adaptation and mitigation and their interaction but
in doing so we identify the need for more integrative
assessment processes. Notable progress could be
made firstly by approaching the issue from a food
system perspective, with more attention being paid to
the whole food chain, since GHG emissions and use
of natural resources occur throughout the entire live-
stock production, distribution and consumption
chains; and secondly by paying attention to social
and equity issues and livelihoods, with the aim of
addressing more comprehensively the multiple bene-
fits and costs associated with different livestock farm-
ing systems in different contexts, and specifically the
fundamental contribution of livestock to the liveli-
hoods of the world’s poor.
There is great potential for all livestock systems
to reduce net GHG emissions, and a combination of
different strategies will be required from the full
range of existing options, adjusted to different live-
stock systems and geographical, social, and institu-
tional contexts. Specifically, grazing and mixed
systems have strong mitigation potential through
practices such as moderate grazing, soil conservation,
and use of local resources; whereas most technologi-
cal and market-oriented mitigation strategies are gen-
erally more applicable to large-scale confined
operations of some industrial systems. However, mit-
igation objectives are unlikely to be met only through
using these solutions, and changes in the demand side
are needed. Here again a more integrated assessment
of demand-side strategies linked to changes in con-
sumption that takes into account the needs of the
poor is also needed. This could include research into
consumer behavior and how policy can provide a
supportive environment for improved adaptation and
mitigation decisions to different contexts. From a
policy perspective, the simultaneous reduction in net
GHG emissions, enhancement of carbon sequestra-
tion, the sustainable use of natural and world food
resources, as well as the maintenance of desirable
social systems might be considered as outcomes of
appropriate livestock farming practices, rather than
goals per se, that can favor both mitigation and
adaptation strategies. There are critical questions as
to why producers and consumers are not adopting
these approaches currently, and what policy stances
would enhance implementation.
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