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Nature Food | Volume 4 | January 2023 | 96–108 96
Nature-positive goals for an organization’s
I. Taylor 1 , J. W. Bull1,2, B. Ashton3, E. Biggs4, M. Clark4,5,6, N. Gray4,
H. M. J. Grub4, C. Stewart7 & E. J. Milner-Gulland 4
Organizations are increasingly committing to biodiversity protection
targets with focus on ‘nature-positive’ outcomes, yet examples of how to
feasibly achieve these targets are needed. Here we propose an approach to
achieve nature-positive targets with respect to the embodied biodiversity
impacts of an organization’s food consumption. We quantify these impacts
using a comprehensive database of life-cycle environmental impacts from
food, and map exploratory strategies to meet dened targets structured
according to a mitigation and conservation hierarchy. By considering the
varying needs and values across the organization’s internal community,
we identify a range of targeted approaches towards mitigating impacts,
which balance top-down and bottom-up actions to dierent degrees.
Delivering ambitious nature-positive targets within current constraints will
be challenging, particularly given the need to mitigate cumulative impacts.
Our results evidence that however committed an organization is to being
nature positive in its food provision, this is unachievable in the absence of
Transformative actions are needed to address the triple challenge of
global biodiversity loss, climate change and improving human wellbe-
. Bold targets are being proposed internationally (for example,
‘nature-positive’ targets that aim to achieve net-positive impacts on
biodiversity by 2030 relative to 2020 (refs. 4–6)) and nationally (for
example, UK Environment Act
and Biodiversity Net Gain policies
These targets are being translated to subnational levels (for example,
). Organizations are committing
to strategic biodi-
aimed at mitigating negative biodiversity impacts,
and increasingly to nature-positive outcomes in line with global
The first step towards achieving these targets is to measure
biodiversity impacts. This enables organizations to design effective
impact-reduction strategies, assess progress towards targets and make
explicit contributions to wider environmental goals10,14–16. Targets and
strategies must also be designed in consultation with affected groups,
to ensure equitable and sustainable outcomes17.
One approach is to use the mitigation hierarchy framework, a
structured approach for impact mitigation towards a specified tar-
get (for example, net gain in biodiversity). It prioritizes prevention
before compensation, beginning with avoiding and reducing impacts
before restoration or offsetting of any unavoidable impacts
. In the
past, this framework has been primarily applied to impacts from the
infrastructure and extractive sectors, although it has been expanded
to agriculture and fisheries
and could be extended to all impacts
from human activities24,25.
However, reactive compensation is not enough to achieve
transformative change. Recently, the ‘mitigation and conservation
hierarchy’ (MCH) has been proposed26, which integrates the reac-
tive mitigation hierarchy with a ‘conservation hierarchy’ for actions
that proactively address historical, systemic and non-attributable
. It provides a framework to support individuals, commu-
nities, businesses and governments to meet ambitious biodiversity
targets. However, this framework has yet to be applied to the full range
Received: 16 February 2022
Accepted: 4 November 2022
Published online: 12 January 2023
Check for updates
1Wild Business Ltd., Kershen Fairfax, London, UK. 2Durrell Institute for Conservation and Ecology, University of Kent, Canterbury, UK. 3Lady Margaret Hall,
University of Oxford, Oxford, UK. 4Department of Biology, University of Oxford, Oxford, UK. 5Nufield Department of Population Health, University of
Oxford, Oxford, UK. 6Oxford Martin School, University of Oxford, Oxford, UK. 7Nufield Department of Primary Care Health Sciences, University of Oxford,
Radcliffe Primary Care Building, Radcliffe Observatory Quarter, Oxford, UK. e-mail: email@example.com; firstname.lastname@example.org
Nature Food | Volume 4 | January 2023 | 96–108 97
sourcing, which is often not available (including here), and their units
(for example, ‘species extinctions equivalents’) can be complex to
communicate. However, they do provide a data-driven approach for
estimating relative biodiversity impacts, which can be compared across
a broad scope of activities.
We estimate the college purchased ~156 tonnes of food over the
2018/2019 academic year, which required ~541,904 m2 of land, result-
ing in a negative biodiversity impact of ~7.9 × 10
species extinctions equivalents (interpretable as a relative measure
of species extinction risk;
Fig. 1a). In line with prior research
the highest biodiversity impacts were driven by foods with dispro-
portionately large land footprints, including red meat, poultry and
fish (linked to 16.5%, 15.7% and 12.6% of total impacts, compared with
3.7%, 3.9% and 1.7% of consumption by mass, respectively; Fig. 1a).
Considerable impacts were also derived from products containing
ingredients sourced from highly biodiverse regions, including des-
serts, chocolate and confectionary (15.1% of impacts, compared with
5.8% by mass), as well as coffee and tea (9.3% of impacts, compared with
0.3% by mass) as has also been highlighted elsewhere
consumed the greatest quantity of food and had the highest overall
impact (36.8%), although the lowest impact intensity (4.6 × 10−12 spe-
cies eq. per kilogram food; Fig. 1b). Conference attendees contributed
a large proportion of overall impacts (33.0%) and had the highest
impact intensity (5.4 × 10
species eq. per kilogram food). Support
of direct and indirect impacts that organizations need to tackle to meet
For many organizations, a key consideration is the embodied
impacts from food consumption by its members
whom organizations can exert influence, for example, through food
options or information in canteens). Food systems are a major driver
of global biodiversity loss, with over one-third of land currently used
for agricultural purposes28 and ~88% of terrestrial birds, mammals and
amphibians predicted to lose habitat to further agricultural expansion
by 2050 (ref.
). Changes to food systems (for example, sustainable
production and trade, reduced food waste and shifting to healthy,
sustainable diets) will be essential for halting global biodiversity
while simultaneously addressing issues of climate, food security
Recently, life cycle analysis (LCA) has enabled development of
large-scale databases on the environmental impacts of foods
. In this
Analysis, we use these datasets to quantify impacts from food con-
sumption of a case study organization, applying the MCH to explore
feasible routes towards achieving biodiversity targets, considering
differences in risk and preference across various consumer groups. We
consider how bold but necessary nature-positive targets (for example,
cumulative biodiversity net gain) could be achieved in this context.
While others have measured biodiversity impacts associated with food
consumption27,37, we provide a robust, quantitative application of the
MCH to this crucial element of environmental impacts, generating
evidence on how organisations can contribute towards a science-based
global goal for nature4,12.
We focus on a higher education college (Lady Margaret Hall, Oxford
University, UK; herein, ‘the college’) and the community of individuals
that work, study and visit as part of its operations. The college canteen
provides food and beverages (herein, ‘food’) regularly for ~500 uni-
versity students, ~130 support and facilities staff, and ~75 academic
staff. The college also prepares food for commercial conference and
event attendees, and for external students attending summer school
programmes. All food is ordered and prepared through the college’s
The college provides a useful case study owing to its detailed
records of food consumption for multiple groups, its keenness to
reduce its environmental impact and its controllable food system.
However, our approach is generalizable to any food-providing organi-
zation, particularly as we make use of consumption datasets that are
often readily available (sales and purchase data). Furthermore, the MCH
is generalizable to other scales (for example, individu-
als tracking their food consumption), other forms of environmental
pressure (for example, greenhouse gas emissions) and other types of
activity beyond food consumption38.
The approach comprises four stages (Table 1): (1) estimating cur-
rent biodiversity impacts from food; (2) defining biodiversity targets;
(3) assessing possible interventions; and (4) exploring different inter-
vention combinations that achieve these targets. Each stage involved
consultation with end users (Methods). For stages 3 and 4, we predomi-
nantly focus on reactive impact mitigation, although we do discuss
possible proactive actions.
Stage 1: estimating biodiversity impacts
Biodiversity impacts from food served at the college were estimated
by pairing 2018/2019 kitchen purchasing data (by mass or volume per
product) with environmental LCA databases34,39. We applied a United
Nations Environment Programme-recommended biodiversity met-
, which estimates the number of species destined for extinction
on the basis of land transformation and occupation in food production
locations. LCA approaches to biodiversity accounting have several
limitations41 (Methods). They ideally require information on food
Table 1 | Approach Overview
Stage Description Method
1: Baseline Estimate biodiversity
impacts from food
identifying focal areas
of high impact (in terms
of both products and
data with LCA data and a
biodiversity metric40 to estimate
impacts per product type and
2: Targets Establish a set of possible
Achievable, Realistic and
targets for future levels of
biodiversity impact from
Identify target options based
on stakeholder consultations
and science-based best
practice (such as aligning with a
Model annual and cumulative
impacts under each target
scenario over the target period to
gauge the level of effort required.
3: Actions Identify possible
interventions that would
reduce impacts under
each of the ‘four steps’:
Refrain, Reduce, Restore,
Scan of relevant academic and
Consult with stakeholders to
identify existing interventions in
place at the college.
Assess each intervention
in terms of potential
Approximate changes to baseline
biodiversity impacts expected
under each intervention.
Assess each intervention in
terms of socio-economic
interviews with key individuals
at the college.
4: Strategy Explore strategies
interventions) for reaching
chosen targets using
different combinations of
interventions that balance
different risks to varying
Model combinations of
interventions and assess
predicted progress towards
A summary of the approach used, applying the MCH framework proposed by
Milner-Gulland et al.26.
Nature Food | Volume 4 | January 2023 | 96–108 98
staff, academic staff and summer school pupils accounted for 11.8%,
11.2% and 7.2% of total impacts, respectively. Further details, including
estimates for greenhouse gas emissions, are provided in Supplemen-
Stage 2: defining targets for impact reduction
We considered five ‘Specific, Measurable, Achievable, Realistic and
Timebound’ (SMART) targets to reduce biodiversity impacts from
food. Possible targets were explored with key stakeholders at the col-
lege (Methods), including an ambitious target broadly aligned with
nature-positive (cumulative biodiversity net gain) and intermediate
steps towards this goal. We modelled annual changes to the college’s
impacts that would be required under each target over a 15 year period
to 2035, given the pragmatic assumption of a slow start to allow for ini-
tial capacity building. A ‘business as usual’ (BAU) scenario was also mod-
elled, assuming that annual consumption remained broadly similar,
Soft drinks and juices
Crustaceans and molluscs
Coee and tea
Egg and egg products
Sandwiches and wraps
Fish and fish products
Wheat products (e.g., bread, pasta)
Nuts, pulses, seeds
Cake, biscuits and desserts
Dairy and dairy alternatives
Potatoes and potato products
Total biodiversity impact (10–9 species extinctions eq.)
Total quantity of food (t or kL)
Support sta Academic sta Summer school
Total biodiversity impact (10–9 species extinctions eq.)
Biodiversity impact per kilogram or litre of food (10–13 species extinctions eq.)
Overall impacts per kilogram or litre
Dairy and dairy alternatives
Coee and tea
Cake, biscuits and desserts
Fish and fish products
Fig. 1 | Food consumption and biodiversity impacts at the college. a, Total
food quantities (in terms of mass or volume) consumed at the college by food
product category (shaded bars) and estimated total biodiversity impacts (in
terms of the additional impacts caused by agricultural land occupation and
transformation) by food product group (coloured bars). b, Biodiversity impacts
per consumer group: shaded bars show impacts per kilogram or litre of total
food consumption (a measure of biodiversity impact intensity) and coloured
bars show the total biodiversity impact per consumer group, separated by
food product. Further details, including impacts in terms of greenhouse gas
emissions, are provided in Supplementary Information.
Nature Food | Volume 4 | January 2023 | 96–108 99
with a slight overall decline in impacts (approximately −10% relative to
annual impacts in the baseline year) driven by national dietary trends44,45
(Fig. 2 and Supplementary Table 1).
First, a process-based target was defined for switching to healthy
and sustainable diets in line with science-based best practice, as set
out by the EAT-Lancet Commission
(‘EL2035’, Fig. 2). It involves linear
change towards 100% adoption of a flexitarian planetary health diet by
2035. Achieving this target would reduce annual impacts by ~33.6% by
2035 against the 2018/2019 baseline. However, this would still result in
substantial cumulative biodiversity loss over the 15 year period, only
~12% less impact than under BAU. This demonstrates the importance
of understanding cumulative outcomes when target setting, and indi-
cates that gradual dietary shift alone is inadequate to tackle the full
extent of impacts.
The four remaining outcome-based targets (‘managed net loss
(MNL) (50%)’, ‘MNL (75%)’, ‘no net loss’ (NNL) and ‘net gain (10%)’ (NG10))
aim to reduce this 15 year cumulative biodiversity impact by a set amount
(respectively, by 50%, 75%, 100% or 110%) by 2035. Therefore, if the target
percentage reduction is missed in any year, it must be compensated for in
subsequent years. For example, under MNL (75%) we assume the college
begins working towards this target in 2021/2022, initially reducing annual
impacts by one-third each year until 2024. Annual biodiversity impacts
are then reduced to net zero by 2031, after which an annual net gain in
biodiversity is needed until 2035 to compensate for impacts incurred
during initial years, thereby achieving an overall cumulative impact
reduction of 75% relative to BAU (Supplementary Table 1).
This demonstrates the ambitious nature even of relative targets
such as MNL75, which would still result in a cumulative net loss of
biodiversity. Additional uncertainty is introduced by MNL targets
being calculated relative to a dynamic counterfactual (BAU), which
may change depending on factors that have not been modelled here
(for example, changes in student numbers, unanticipated effects of
coronavirus disease 2019, or changes in food production practices or
efficiency). Achieving more stringent nature-positive targets for cumu-
lative biodiversity net gain (for example, NG10) would thus require
urgent and substantial action38.
Stage 3: assessment of interventions
We collated a set of 44 interventions (actions that mitigate biodiversity
impacts from food; Supplementary Table 2) from the academic and
grey literature, categorized according to the four steps of the MCH
(Refrain, Reduce, Restore, Renew). Interventions included top-down
and bottom-up approaches, as well as environmentally sustainable
sourcing and options for compensation. We considered each inter-
vention’s technical potential (effectiveness for reducing biodiversity
impacts) and socio-economic feasibility (or ‘initiative feasibility’
following previous research21,22,46,47; Table 2).
Technical potential was quantified on the basis of biodiversity
impacts estimated in stage 1, further informed by relevant academic
literature. Socio-economic feasibility was qualitatively assessed for
each consumer group through semi-structured interviews with key
stakeholders (the head chef, catering manager and domestic bursar;
Supplementary Table 2). It was not within scope to conduct an in-depth
review of behaviour-change interventions, and we acknowledge the
limitations of our assessments (for example, limited accounting for
; Methods). A more comprehensive analysis of
behaviour-change interventions—utilizing specific behaviour-change
frameworks (for example, refs. 48–50)—may have led to different conclu-
sions. However, the expertize of our stakeholders provides a useful
basis for decision making and strategy prioritization.
Stakeholder consultations revealed key considerations and con-
straints at the college, including: (1) ensuring consumers’ wellbeing
by providing healthy and nutritionally balanced food, (2) ensuring
freedom of choice and a variety of meal options, (3) ensuring ethical
and sustainable sourcing, and (4) budgetary constraints.
Interventions covered a broad spectrum of socio-economic fea-
sibility and biodiversity risks (Table 2 and Supplementary Table 2).
Top-down interventions to restrict the highest-impact foods (‘Refrain’)
2018 2020 2022 2024 2026 2028 2030 2032 2034
Cumulative net biodiversity impact
Academic year end
BAU EL2035 MNL50
MNL75 NNL NG10
2018 2020 2022 2024 2026 2028 2030 2032 2034
Annual net biodiversity impact
Academic year end
Fig. 2 | Net changes in cumulative and annual biodiversity impacts from
food, modelled for five illustrative target scenarios and a BAU scenario. a,b,
Values below ‘0’ represent a cumulative (a) or annual (b) net positive impact on
biodiversity (that is, biodiversity net gain). The BAU scenario assumes similar
impact each year with a slight declining trend based on data from the UK National
Diet and Nutrition Survey44. EL2035 represents a process-based target for the
college to switch to serving healthy and sustainable diets by 2035, based on
EAT-Lancet recommendations33. MNL targets aim to reduce cumulative impacts
relative to BAU by 50% (MNL50) or 75% (MNL75). NNL and NG10 aim to mitigate
100% of absolute cumulative impacts, with additional compensation to achieve
10% biodiversity net gain under NG10. For more detail, see Supplementary Table 1.
Nature Food | Volume 4 | January 2023 | 96–108 100
had higher technical potential, but lower levels of feasibility due to the
social risk of restricting consumer choice and the potential for leakage
(consumers deciding to eat high-impact food products elsewhere).
The reverse was true for bottom-up interventions aimed at shifting
consumer choice (that is, behaviour-change interventions; ‘Reduce’).
Environmentally sustainable sourcing (‘Reduce’) had strong but highly
uncertain technical potential, with effectiveness contingent on supply
chain transparency10,51–53, product affordability and extent of leakage
(displacement of sourcing impacts to other organizations given supply
of sustainable products may be limited). Furthermore, the low biodi-
versity impact of these products may trade off with other aspects of
sustainability important to the college (for example, greenhouse gas
emissions or animal welfare34).
Compensatory actions under the mitigation hierarchy could
include restoring biodiversity directly affected by the college’s food
consumption (‘Restore’, for example, on or near farms where ingre-
dients are sourced) and restoring equivalent biodiversity (offset-
ting) elsewhere (‘Renew’)18. Our chosen biodiversity metric has many
assumptions (Methods), and there is limited information on food
origin or production practices, limiting the accurate calculation of
ecologically equivalent54 areas for restoration that would compensate
for negative impacts. Other uncertainties include ensuring additional-
ity, long-term monitoring, compliance and cost55.
Once all impacts have been mitigated, an aspirational bio-
diversity net gain target can be achieved through proactive
biodiversity-enhancing actions26. Examples include contributing
to research, education and innovation in sustainable food systems
(Refrain/Reduce), supporting local restoration/re-wilding projects
(Restore) or creating community food gardens (Renew). Although these
actions are challenging to quantify and cannot be counted towards a
biodiversity net gain target until direct impacts have been mitigated,
they may help avert future biodiversity losses from food systems and
can build wider support for biodiversity and its social benefits.
Stage 4: exploring strategies for impact mitigation
Our final step was to investigate the feasibility of achieving each of the
outcome-based targets described in stage 2 by combining interven-
tions. A set of five exploratory strategies was constructed, balancing
risks and uncertainties identified at stage 3 to varying degrees (Fig.
3 and Supplementary Table 3). The biodiversity impact mitigation
potential of each strategy was quantified on the basis of stage 1 and 3
results, and provides an approximation intended to inform organiza-
tional decision making.
Strategy A aims to prevent (‘Refrain’ and ‘Reduce’) as much bio-
diversity impact as possible while providing a healthy diet. It involves
the college switching to nutritionally balanced vegan food, with all
ingredients sourced from best-practice suppliers for biodiversity
(assuming the same overall mass of food is served). Given the techni-
cal and feasibility assessments, this strategy is unlikely to be socially,
financially or logistically achievable in the near future. Risk of leakage
(Table 2) means the potential benefits of this strategy are unlikely to be
realized until system-wide changes beyond the college’s direct control
are implemented. If such changes were to occur, the scenario indicates
that ~83% of annual biodiversity impacts calculated in stage 1 could
theoretically be preventable; ~42% from serving vegan food and ~41%
from biodiversity-friendly sourcing (Fig. 3). If the college also halved
its consumption of coffee, chocolate and palm oil, preventable impacts
could be up to ~88%. However, a ‘flexitarian’ diet (allowing for small
amounts of meat, fish, dairy and eggs)33 combined with best-practice
sourcing could still prevent ~79% of impacts, indicating that consider-
able progress could be made without requiring controversial measures
such as banning animal products.
Strategies B–E show various combinations of interventions
considered potentially feasible for the college, based on stage 3
results. They range from a top-down ‘avoidance-focused’ approach
(lower risk for biodiversity, but high choice infringement) to a
bottom-up strategy focusing on behavioural interventions and
best-practice sourcing (high biodiversity uncertainty, but less risk
for consumers). ‘Refrain/Reduce’ actions could enable the college
to make good progress towards each target (~37–42% impact mitiga-
tion for strategies B–E). However, achieving more ambitious targets
would require a considerable level of restoration/offsetting (68–73%
of impacts for NG10), particularly when compared with strategy A.
Given the need for a slow start to build capacity, this issue would be
exacerbated by the need to over compensate in later years to reach the
specified cumulative target (see stage 2).
Furthermore, while targets could in theory be achievable through a
more bottom-up strategy (for example, strategy E), large uncertainties
for behavioural and sourcing interventions make mitigation difficult
to predict, achieve or measure. While such interventions are valuable,
enacting top-down measures will be key to ensuring that biodiversity
outcomes are achieved. Assessments of financial feasibility for each
strategy would also need to be carried out, accounting for product
purchase and offset costs, commercial viability, fair pricing for con-
sumers, and potential funding streams.
These results highlight the challenge for organizations in
achieving nature-positive targets (for example, NG10), since even
avoidance-weighted strategies (for example, strategy B) would incur
substantial residual impacts, requiring considerable levels of offset-
ting to meet targets within current socio-economic constraints. The
challenge is enhanced by the difficulties of calculating, delivering and
monitoring offsets11,23,54. particularly when limited sourcing informa-
tion is available. Crucially, issues around leakage suggest that achieving
true nature-positive outcomes would require urgent systemic action
beyond the direct influence of the college56.
Recovering biodiversity one organization at a time
Here we have applied the MCH to address the globalized impacts of an
organization’s food consumption, quantifying biodiversity impacts
and framing potential targets and strategies within context-specific
constraints. By considering varying levels of impact and feasibility for
different consumer groups, we highlighted variation in opportunities
and constraints, and suggested targeted group-specific strategies.
Accounting for behavioural plasticity (through trialling and monitor-
ing interventions) and gathering further data on food sourcing would
inform better-targeted approaches for impact mitigation and com-
pensation in future.
Our approach is generalizable across scales, environmental pres-
sures and sectors
. Our case study organization is both an educa-
tional institution and an events catering business, so results may be
applicable across a broad range of food-providing organizations.
However, it is hard to know how scalable our results are until similar
analyses are carried out, and we recognize that consumers at the col-
lege may not be representative of the wider population.
Transparency regarding the scale of the challenge is essential
to achieving ethical and sustainable paths towards nature-positive
goals17,57. Here we show for one organization that mitigating the embod-
ied biodiversity impacts of their food may not currently be feasible. A
recent example applying this framework to the operational biodiversity
impacts of Oxford University38 similarly found that strategies consid-
ered feasible by the focal organization left substantial residual impacts
needing to be offset to achieve a net gain target.
However, reversing global biodiversity loss remains urgent and
, and will require organizations to take rapid and ambi-
tious action on food and other elements of their operations. Actions
will in some cases need to be top down, may result in socio-economic
risk and will require engagement with affected communities. Delay-
ing action will lead to extensive negative impacts requiring compen-
sation later. However, if more organizations commit to ambitious
nature-positive pathways, issues of leakage are likely to reduce
Nature Food | Volume 4 | January 2023 | 96–108 101
(for example, through shifting dietary norms and creating greater
demand for biodiversity-friendly produce), and strategies that appear
highly ambitious for a single organization today may become feasible.
We have evidenced the urgent need for wider transformative
change to minimize the impacts of food systems
, which will allow
consumers and food providers to make more sustainable choices
Table 2 | Technical and feasibility assessments
(average % impact
Biodiversity risks and
and logistical risks and
risks and beneits
serving the most
meat, ish, coffee,
chocolate and so
(N=11) Generally lower risk due
to focus on prevention
(not compensation). Risk
of leakage if consumers
seek restricted foods
elsewhere (particularly if
May be time- and
for kitchens to produce
a good variety of
Ingredient costs may
increase or decrease,
depending on the
infringement risk for
those who eat regularly
at the college. Some
(for example, academic
staff) have previously
on meat. Others (for
groups) have advocated
(1) Apply to conference/ summer
school attendees who eat
infrequently at the college; (2)
avoid refraining from serving highly
valued/easily accessible foods (for
example, coffee and chocolate) to
minimize leakage; (3) for students/
staff, focus on sustainable sourcing,
bottom-up interventions and
reducing use where possible.
(N=4) Uncertain effectiveness
as this would be
(for example, owing to
reliant on long-term,
bottom-up changes in
dietary choices, rather
than instant changes
to organizational food
would be low cost and
simple to carry out (for
menus), others may
require more resources
and collaboration (for
No restriction on
although could be
perceived as choice
(1) Implement simple interventions
soon (for example, increasing ratio
of low-impact options on conference
menus); (2) collaborate to implement
more complex interventions
(for example, eco-labelling); (3)
monitor implemented behavioural
interventions to improve estimates
of effectiveness and behavioural
products and using
8.8% (2.4–1 8.8%)
(N=7) High uncertainty
due to lack of supply
food production may
trade off against other
aspects of sustainability;
impacts may be
displaced to other
may have more limited
availability and higher
Avoids risk of choice
May result in pricing
changes at the college
(1) Source environmentally
sustainable foods where
budget allows (for example, in
more commercial aspects of food
provision), particularly for impactful
foods that are unable to be avoided
entirely; (2) identify opportunities
for low-cost, seasonal and local
sustainable sourcing (for example,
allotment produce, repurposing
excess food and so on).
food waste (for
use of ingredients
Not possible to
owing to data
Reducing the amount
of food wastage
would help to reduce
There is uncertainty in
how much ‘repurposed’
wasted food would be
replacing rather than
adding to consumption.
The college already
measures to minimize
resources would be
needed for monitoring
with food redistribution
No identiied negative
impact on consumers.
Consumers may beneit
(1) Participate in existing lexible food
redistribution schemes as and when
required; (2) increase rates of onsite
(3) improve monitoring of waste
to compensate for
affected by college
on the nature
and extent of
and the chosen
High risk unless carried
out according to best
by a lack of supply
chain transparency and
assumptions made in
the biodiversity metric
Likely to be expensive,
requiring novel funding
streams, availability of
expertize, and adequate
on the market (for
May result in pricing
changes at the college
(1) Seek greater transparency in all
college food supply chains to enable
appropriate targeting of offsets to
the site of biodiversity impact.
local or global
quantiiable. Must not be used as a
substitute for offsetting
of speciic, quantiiable
biodiversity impacts (to
Resource or funding
required but potential
initiatives that produce
May deliver added
social beneits (for
for college members,
or empowering local
communities in areas of
(1) Pursue proactive actions that
will help reduce future impacts
(for example, supporting research,
innovation and education on
sustainable food systems); (2)
maximize the social beneits of
proactive actions; (3) do not replace
quantiiable impact mitigation with
Results of the technical and feasibility assessments for different categories of interventions, under the four steps of the MCH—Refrain, Reduce, Restore and Renew. Ranges provided for the
‘Technical mitigation potential’ column show the range of average biodiversity impact reduction across the number of interventions that were assessed (‘N’) and are not an indication of
statistical uncertainty (which cannot be estimated). Additional detail on speciic interventions, consumer group-speciic assessments and sources is provided in Supplementary Table 2.
Nature Food | Volume 4 | January 2023 | 96–108 102
at lower socio-economic cost
. Measures will be required across all
scales (for example, government incentives, improved production and
procurement practices, improved market standards, increased moni-
toring and transparency, improved biodiversity metrics, systematic
approaches to offsetting and shifts in consumer behaviour) and will
need to be integrated with other societal goals34,51,58,59. Organizations
can make genuine, positive contributions to catalysing these changes
through mitigation of impacts and proactive conservation efforts23.
As new global biodiversity targets are being set, organizations have a
critical opportunity to change their food systems, bringing themselves
closer to a nature-positive future. If enough of them do this, societal
transformation can be provoked.
Context and participatory approach
This research was based at a University of Oxford college (Lady Mar-
garet Hall, Oxford, UK) and was carried out during July to December
2020. The college community consists of ~500 university undergradu-
ate and postgraduate students, ~130 members of support staff and
~75 members of academic staff. The college has a central canteen,
providing daily food and beverages (herein, ‘food’) at subsidized rates
for students and free of charge for staff. The college also runs a com-
mercial food service, frequently preparing food for conference, event
and annual summer school attendees. All food is ordered and prepared
through a central kitchen coordinated by a head chef and catering
manager. Along with the college’s domestic bursar, these individuals
were considered the primary end users of this applied research and
were involved throughout its inception and delivery in a participatory
and iterative manner.
Stage 1: estimating baseline quantities and biodiversity
impacts of food served at the college
Sources of food purchasing data. Our analysis was based on food pur-
chased by the college during the financial (academic) year of 2018/2019,
chosen as the most recent year for which a complete dataset was avail-
able and before the impacts of the coronavirus disease 2019 pandemic.
For feasibility, analyses were based on 3 months of invoice data from
September 2018, February 2019, and July 2019. These months captured
different aspects of the college’s food service: the main conference
season, standard term time and summer schools, respectively. Data
were primarily obtained from the college’s online procurement system,
supplemented with data from eight additional suppliers. All aspects
of food under the control of the college’s catering department were
captured; this did not include food prepared by students. The final
dataset consisted of 4,651 individual purchase records, 1,612 unique
food products and included information on date, supplier, product
code and description, number of units purchased, and cost per unit.
Information on product mass or volume per unit was included for 37%
A B C D E
Percentage of impacts from food consumption mitigated
RENEW: osets + proactive actions under
the conservation hierarchy
RESTORE and oset residual impacts
REDUCE impacts through best-practice
REDUCE consumption of impactful food
through behavioural interventions
REDUCE the amount of impactful foods
REFRAIN completely from serving the
most impactful foods
(A) 'Preventable impacts'
(C) 'Mixed approach'
Low biodiversity risk
High social risk
High biodiversity risk
Low social risk
Fig. 3 | Comparison of five strategies for mitigating the biodiversity impacts
of food served at the college. A breakdown of individual interventions per
strategy can be found in Supplementary Table 3. Each strategy is represented
by a bar covering 1 year’s worth of biodiversity impacts. The y axis shows the
approximated mitigation potential, such that 0% represents no action taken
(stage 1 baseline impacts) and 100% represents NNL of biodiversity resulting
from college food consumption. Dotted lines represent average annual impacts
required under the different cumulative targets described in Fig. 2 (recognizing
that in some years these targets may be missed, whereas in other years targets will
need to be surpassed to compensate for missed years). Interventions that refrain
from or reduce impacts (shown in blue and green) should be given precedence
over compensatory actions such as biodiversity offsets (orange and red). Here,
compensatory actions are considered only in terms of the extent of residual
impacts needing to be restored or offset, rather than the areas or types of species
or ecosystems to be targeted. Note that the values provided here are indicative
for use in informing pragmatic policy decisions and are based on numerous
assumptions, which are described in Methods and Supplementary Information.
Nature Food | Volume 4 | January 2023 | 96–108 103
of products. Records were sorted into 63 product categories for further
analysis, based on food type and price of product.
Estimating quantities of food served. Owing to limited available
information on product mass or volume, these values were directly
estimated for the 200 most frequently purchased products (which
accounted for 70% of all purchased units). Estimates were based on
information within supplier catalogues, other college purchasing
reports or supermarket websites. All food categories included a mini-
mum of 50% of items with direct mass or volume estimates (average per
category: 89%). For the remaining 41% of unique products with no mass
or volume estimate, this was approximated on the basis of an average
cost-to-mass (or volume) ratio for each food category. For records
with an unknown product description (9% of records), mass or volume
of the product was approximated based on the known breakdown of
food categories and average gram or millilitre per £1 for the product
supplier. This approach was deemed reasonable, as most ‘unknown’
products came from specialized suppliers (for example, butchers).
However, most records had detailed estimates and final values were
sense checked by college stakeholders.
Estimating biodiversity impacts from food. The 1,589 unique prod-
ucts were matched to a corresponding item in one of the following
environmental datasets to obtain its biodiversity impact value:
(1) A dataset derived from Poore and Nemecek34,60, of 55 raw
ingredients with their associated environmental impacts,
including land occupation and transformation values, based on
a meta-analysis of global LCA studies. The LCA system boundary
ranged from agricultural inputs at farm stage to retail stage (for
details, see ref. 34). Environmental values were provided for each
ingredient at three levels of impact based on the range of pro-
ducers assessed: low (5th percentile), average (50th percentile)
and high (95th percentile). Biodiversity impacts were quantied
using a United Nations Environment Programme-recommended
metric developed by Chaudhary et al.40. This models the number
of expected global species extinctions (‘species extinctions
equivalent’) for a given area of land occupation (extent × time
occupied) and transformation (land use change) per food item
and country, based on the countryside species–area relation-
ship model and species vulnerability scores (including levels of
threat and endemism). Further details on underlying models are
provided in Chaudhary et al.40.
(2) An extensive database of products from six major UK online
supermarkets (‘foodDB’, developed by Harrington et al.39 and
used under license). An extract containing back-of-packet in-
gredients for 2,138 unique supermarket products was obtained.
Products consisted of composite food items in categories such
as ready meals, sandwiches, desserts and sweet treats, pies and
quiches, as well as specic vegan and vegetarian products. Raw
ingredients for each product were paired with corresponding
ingredients in dataset 1 and weighted according to quantity
to derive overall biodiversity impacts per 100 g of supermar-
ket product. Full details on the dataset and methodology are
described in Clark et al.61,62.
(3) A dataset derived from foodDB, with biodiversity impact values
aggregated at the supermarket ‘shelf’ level, as opposed to spe-
cic products. This dataset captured a broader range of food
items than dataset 2 (including 3,687 shelf categories) and was
used for more generic categories of composite food items (such
as ‘red wine’, ‘chocolate bars’, ‘dairy-free cheese’ and so on). It
was applied when an appropriate match could not be identied
in dataset 1 or 2, and where a specic product was not required
(that is, owing to low intra-category variation in environmental
Biodiversity impacts could then be derived by multiplying the
mass or volume of each product by the impact values in the correspond-
ing databases. Generally, the median (50th percentile) impact values
were used (but see below).
Accounting for existing sustainable sourcing efforts. Consulta-
tions with college stakeholders identified that certain products were
routinely sourced with sustainable certifications (for example, all pur-
chased tea, coffee and sugar was either Rainforest Alliance or Fairtrade
certified). To broadly account for this, a weighted combination of 50th
(64%) and 5th (36%) percentile impacts was used for these certified
products. This was based on the assumption that certified products
were likely to have some positive impact on biodiversity relative to
average (50th percentile) products, but these positive effects could
be weak or uncertain. Percentage weightings were based on DeFries
. While this was a broad approximation, it was an evidence-based
way to account for actions already undertaken in the absence of more
detailed data on product-specific impacts.
Scaling up and allocating impacts. To calculate biodiversity impacts
for the full baseline year (2018/2019) and allocate portions of impacts to
each of the college’s main consumer groups outlined above, estimates
for the three focal months were factored up on the basis of a breakdown
of annual food costs provided by college stakeholders. This was done by
calculating the average quantity (mass or volume) or impact (species
extinctions equivalents) per £1 spent for each consumer group across
the three focal months, and then multiplying this value by the overall
amount spent per consumer group for the full year.
Key uncertainties and assumptions for stage 1. The methods used
here were the best available at the time and provided a set of estimates
from which decisions could justifiably be made by college stakeholders.
However, they are necessarily broad and based on several assumptions:
i. When factoring up estimates based on food costs, we
assumed that food consumed during the three focal months
was representative of the food consumed during the rest
of the baseline year (2018/2019). Thus, there may be some
unaccounted-for seasonal variation (although college stake-
holders stated this was minimal). Furthermore, this analysis
focuses on a single year.
ii. The chosen biodiversity metric only measures impact on the
basis of one component of biodiversity (species) ignoring
other components, such as habitats, ecosystems and genetic
or functional diversity. Its development was based on datasets
biased towards certain taxa (terrestrial vertebrates and vascular
plants) and geographic regions (often high income or high bio-
diversity), not accounting for the impact of agriculture on taxa
important to continued ecosystem functioning (for example,
soil microbes, plants and arthropods) or freshwater and marine
taxa. The metric is intended for calculating relative levels of
impact on biodiversity, and cannot be interpreted in terms of
absolute impact owing to assumptions made in its calculation40.
iii. The biodiversity metric focuses only on the eects of land
use on biodiversity, not directly including other important
pressures on biodiversity, such as over-extraction of water, pol-
lution, climate change, direct exploitation of wild populations
or invasive species. The relative biodiversity impact for food
products may therefore be under- or overestimated. For exam-
ple, relative biodiversity impacts of red meat might be higher if
the indirect impacts on biodiversity from climate change were
considered (Supplementary Information).
iv. In the absence of information on the region from which food
products were sourced, datasets were based on global average
LCA data per product. Any region-specic dierences in food
Nature Food | Volume 4 | January 2023 | 96–108 104
product impacts were unable to be accounted for. While assum-
ing global average sourcing introduces uncertainty, high-level
sensitivity analyses indicated this assumption is unlikely to
change the main conclusions. Ingredients with the highest
environmental impacts in the baseline scenario tended to also
have the highest impact whether sourcing from best-case (5th
percentile impacts) or worst-case (95th percentile impacts)
producers (Supplementary Information). However, when
product-specic information on food sourcing becomes avail-
able, future analyses could incorporate biodiversity impacts
that reect an organization’s actual food supply chains. This
would have additional benets, for instance providing insight
into how an organization’s negative impact on biodiversity
might be compensated by actions with a ‘like-for-like’ biodiver-
sity benet (for example, in the same country and ecosystem
v. Certain food categories are likely to be less accurate than oth-
ers. All sh was assumed to be produced through aquaculture
rather than wild caught (college stakeholders said this was
representative of their sh sourcing). Additionally, impacts for
lamb and mutton products were based on a single set of LCA
values, meaning that 5th and 95th percentile impacts could not
be estimated. Given that lamb was purchased in quantities an
order of magnitude lower than other meats, it is unlikely that
this had a substantial eect on the overall results.
vi. With regard to datasets 2 and 3, limited data were available
for ingredient composition of certain products, so estimated
environmental impacts have limited reliability. However, these
products tended to be ‘low-impact’ foods, so this lack of data is
unlikely to have substantial eects on overall results.
Stage 2: constructing target scenarios
Modelling the BAU scenario. The BAU scenario was calculated on
the assumption that the quantity and type of food served at the col-
lege would remain similar each year until 2035. Slight changes were
predicted to occur in certain food groups, based on trends in the UK
government’s National Diet and Nutrition Survey
, including average
annual increases of 2.7 g of vegetables and 1.1 g of poultry, and average
declines of 2.1 g of red meat and 4.1 ml of fruit juice per person per day.
These trends were converted to percentage changes, based on known
total average daily intakes per person per ingredient in the National Diet
and Nutrition Survey data, and yearly percentage changes were applied
to baseline impacts described in stage 1. This BAU scenario does not
consider possible changes to community numbers and associated con-
sumption patterns in future years, as this information was unknown.
Process-based target: modelling the ‘Healthy and Sustainable
Diets’ target (‘EL2035’). The ‘EL2035’ target was calculated on the
basis of best practice in healthy, sustainable diets, as set out by the
EAT-Lancet Commission on Healthy Diets from Sustainable Food Sys-
. Food products purchased by the college were disaggregated
into their constituent ingredients, using datasets 2 and 3 where nec-
essary (that is, for composite food products). This provided a pro-
portional breakdown of the total mass or volume of raw ingredients
served at the college during the baseline year. To predict impacts under
an EL2035 target in 2035, these proportions were altered to match
the proportions of an EAT-Lancet ‘flexitarian’ diet (assuming 100%
uptake, specific dietary values taken from Supplementary Table 7 in
Springmann et al.31), with the assumption that overall mass or volume
of food served would remain constant. These new proportions were
combined with biodiversity impacts per food product (as described
above) to estimate overall impacts. Consumption of ingredients that
were not captured within the EAT-Lancet dietary recommendations (for
example, tea and coffee) was assumed to remain the same.
Outcome-based targets: modelling cumulative targets. The four
remaining outcome-based targets (‘MNL50’, ‘MNL75’, ‘NNL’ and ‘NG10’)
aim to reduce cumulative biodiversity impacts by a set amount by 2035
(respectively by 50%, 75%, 100% or 110%). Targets were modelled on the
basis of their overall cumulative outcome, with a period of capacity
building in the initial years of the scenario (Supplementary Table 1).
These scenarios were chosen to represent increasing ambition towards
achieving a nature-positive target.
Stage 3: assessment of interventions
Collation of interventions. Possible interventions to reduce biodiver-
sity impacts from food at the college were identified from a high-level
review of the academic literature (a full systematic review was out of
scope). The search strategy involved identifying existing systematic
academic reviews of behaviour-change interventions63–66, along with
key sources of grey literature
, and expanding the search following
a snowball sampling strategy (following references and citations)
until no additional intervention categories were highlighted. A cat-
egory could include several similar interventions, such as promoting
pro-environmental social norms through various forms of advertising.
These were further refined on the basis of consultations with stakehold-
ers to identify and exclude any interventions already in place at the
college (and therefore captured under baseline impact calculations).
The final list of interventions along with relevant sources is provided
in Supplementary Table 2.
Technical assessment. Percentage reductions in biodiversity impact
(technical potential values) were calculated for each intervention using
one of three approaches, depending on intervention type:
1. For top-down interventions that restricted quantity of certain
foods served at the college, the change in impacts was esti-
mated by substituting highly impactful foods with the same
mass or volume of their lower-impact equivalents (for example,
by replacing 100 kg of red meat with 100 kg of plant-based meat
alternative products). Replacements were made on the basis of
ingredient mass or volume, not on the basis of calories or nutri-
tion. This was considered practical, as it reects the functional
replacement of an ingredient in a recipe, which is more easily
communicated to catering sta.
2. For interventions focused on sourcing ingredients from produc-
ers with the lowest impacts on biodiversity, we used the range
of impact levels provided by dataset 1. Average (50th percentile)
impact values used in calculating the baseline were replaced
with low (5th percentile) impacts (for example, replacing 100 kg
of average red meat with 100 kg of red meat sourced from the
top 5% of producers in terms of reducing biodiversity impacts).
3. ‘Bottom-up’ interventions (for example, behaviour-change
interventions) were challenging to predict since these are
highly dependent on context and consumer responses. We used
indicative estimates of impact based on previous examples in
the literature (Supplementary Table 2), broadly assuming that
the proportional change estimated in these studies would apply
to ingredients and meals at the college. Literature sources were
identied from our review of behavioural interventions and
selected on the basis of similarities in context (that is, food in
a higher education setting)68–72. These estimates are therefore
only rough, order-of-magnitude indications used to inform
policy recommendations; trials and monitoring at the college
would be needed to assess the actual changes that these types
of intervention might achieve.
Feasibility assessment—stakeholder consultations. The feasibil-
ity assessment for interventions was completed using information
from interviews and follow-up discussions with three key food and
Nature Food | Volume 4 | January 2023 | 96–108 105
operations staff members at the college (head chef, catering manager
and domestic bursar). Semi-structured interviews were carried out
in early 2020 as part of the Wellcome Trust -funded ‘Our Planet Our
Health’ (Livestock, Environment and People—LEAP) project. Interviews
were carried out with informed consent of participants and approval
from the University of Oxford’s Central University Research Ethics
Committee (reference number R68035 /RE002).
The interviews followed a set of questions that aimed to (1) under-
stand how the college’s food service operations work, (2) identify
facilitators and barriers to implementing environmental initiatives to
promote sustainable meals and (3) understand lessons learned from
environmental initiatives that have been tried previously in the college.
Interviewees were questioned on whether sustainability measures had
been discussed and implemented at the college, both generally as well
as measures relating specifically to food. They were also asked whether
responses to measures had been positive or negative for different
stakeholders, and the perceived reasons for those responses. Some
questions were specifically focused on approaches to meat consump-
tion at the college. Additional information on specific aspects of the
college’s operation, core values and food provision was gained through
further ad-hoc discussions.
Interventions were assessed against qualitative information in
notes from these interviews, to identify key relevant points relating
to social, logistical and financial risks or opportunities (as captured
in Table 2). Information regarding specific consumer groups was used
to categorize the level of social risk (in terms of poor, moderate or
adequate perceptions of an intervention; Supplementary Table 2),
with additional reference to responses when similar interventions have
been trialled in the past, or predictions based on stakeholder familiar-
ity with consumer requirements and values. As such, the categoriza-
tions used here are based on well-informed assumptions about likely
stakeholder responses. This was a pragmatic approach to prioritizing
interventions to aid decision-making processes; the relevant expertize
of stakeholders makes this a good basis on which to begin prioritizing
strategies and interventions.
Stage 3 limitations. As it was not within scope to conduct an in-depth
review and comprehensive analysis of interventions, it is important to
acknowledge the limitations of our approach:
Technical assessments for ‘top-down’ interventions involved tak-
ing an average value for plant-based meat alternatives, rather than
considering for example, direct vegetable substitutes. Further, the
approach to modelling sustainable sourcing assumed a switch from
50th percentile producers to producers with the minimum level of
impact (5th percentile). This therefore does not consider the actual
availability of such low-impact products to the college.
For bottom-up interventions, limiting the assessment to
behaviour-change studies in similar university settings meant that few
studies were used to inform estimates of technical potential, therefore
limiting consideration of behavioural plasticity (that is, the extent to
which the interventions actually change consumer behaviour
may influence the effectiveness of interventions. Moreover, the risks
and benefits to consumers assessed as part of our socio-economic fea-
sibility assessment arose through interviews with college stakeholders,
and while the importance of these expertise-driven insights should not
be underestimated, some of the concerns raised were hypothetical, and
may not reflect actual behaviour should the interventions be enacted.
The latter two limitations emphasise the importance of (1) run-
ning surveys or focus groups with affected consumers to more directly
understand consumer perceptions, (2) trialling proposed initiatives
and gathering data to estimate behavioural plasticity, (3) applying spe-
cific behaviour-change frameworks for a comprehensive analysis (for
) and (4) monitoring changes in consumer behaviour
or perceptions and adapting the approach accordingly. We recommend
consideration of these points in future applications of our approach,
although the methods used here provide a solid, pragmatic basis for
prioritizing strategies for initial implementation.
Stage 4: modelling mitigation strategies
Strategy A. Strategy A assumes that the college serves no
animal-derived food products and sources all ingredients from pro-
ducers with the lowest impacts on biodiversity. Percentage reductions
in impact were calculated following a similar approach to the ‘Healthy
and Sustainable Diets’ target (EL2035): baseline food quantities were
disaggregated into individual ingredients and relative proportions
were altered to nutritionally balanced vegan dietary proportions
(obtained from Supplementary Table 7 in Springmann et al.31). Newly
proportioned food impacts based on average (50th percentile) values
were then replaced with low-impact (5th percentile) values to account
for environmentally sustainable sourcing.
Combining interventions in strategies B–E. Supplementary Table
3 lists the specific interventions included in strategies B–E. Interven-
tions were applied sequentially to avoid double counting of mitiga-
tion potential (for example, if a strategy contained more than one
intervention pertaining to the same category of food). For strategy E,
an assumption was made that the impacts of ‘bottom-up’ behavioural
interventions would be additive, that is, we do not account for any inter-
actions that might occur when co-implementing several behavioural
interventions. As such, percentage reduction values for these behav-
ioural interventions are indicative only, although this was considered
adequate for the purposes of informing policy decisions at the college.
Interviews were carried out with informed consent of participants and
approval from the University of Oxford’s Central University Research
Ethics Committee (CUREC reference number R68035/RE002).
Further information on research design is available in the Nature Port-
folio Reporting Summary linked to this article.
Data on environmental impacts per food ingredient34 (dataset 1
described in Methods) is publicly available via the Oxford University
Research Archive depository60. Data providing environmental values
per food product linked to foodDB
(see description of datasets 2 and 3
in Methods) is described by Clark et al. (2022)
with an anonymized ver-
sion of this dataset freely available via the Oxford University Research
. Owing to legal constraints, non-anonymized
data from the foodDB database is available under license upon request
(foodDBaccess@ndph.ox.ac.uk). Datasets on food product quantities
and anonymized interview responses used in this study are available
from the corresponding author on reasonable request. For legal con-
fidentiality reasons, financial data from the college cannot be made
publicly available. Source data are provided with this paper.
Code relating to calculations of environmental values per food product
(as per Clark et al.
) is available on the Oxford University Research
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The authors acknowledge and thank interview participants for their
time and their helpful insights. We also thank J. Poore and the team at
the foodDB project39, whose datasets underpin the analyses carried
out here. This manuscript arises from research funded by the John
Fell Oxford University Press Research Fund (funding to E.J.M.-G.,
H.M.J.G., I.T., J.B. and E.B.). M.C. and C.S. were funded by the Wellcome
Trust, Our Planet Our Health Programme (Livestock, Environment and
People—LEAP, award number: 205212/Z/16/Z). N.G. was funded by the
Crankstart Scholarship scheme.
All authors have provided content, reviewed, edited and approved
this manuscript. I.T. coordinated the project, including conducting
analyses and initial drafting of the manuscript. E.J.M.-G. supervised the
project, with co-supervision provided by J.W.B. and additional project
coordination provided by H.M.J.G. E.B. and N.G. provided support with
data processing and impacts analysis. M.C. contributed and supported
the use of datasets relating to the environmental impacts of food
products. C.S. conducted and recorded participant interviews. B.A.
represented and liaised with the focal college, providing underlying
datasets as well as key contextual information.
The authors declare no competing interests, but we note for
transparency that B.A. is an employee of Lady Margaret Hall (the focal
organization of this study).
Supplementary information The online version contains supplementary
material available at https://doi.org/10.1038/s43016-022-00660-2.
Correspondence and requests for materials should be addressed
to I. Taylor or E. J. Milner-Gulland.
Peer review information Nature Food thanks Brent Loken, Kristian
Nielsen and Martine Maron for their contribution to the peer review
of this work.
Reprints and permissions information is available at
Nature Food | Volume 4 | January 2023 | 96–108 108
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Data collection No software used for data collection. Collection methods for data extracts used in this study are described in prior works (Poore & Nemecek,
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Data on environmental impacts per food ingredient (dataset (1) described in Methods) is publicly available via the Oxford University Research Archive depository
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Study description This study explored how Nature Positive targets can be achieved for organisations through a novel application of the Mitigation and
Conservation Hierarchy Framework, focusing on the embedded biodiversity impacts associated with food consumption. The study is
split into four stages
Stage 1: Annual impacts from food consumed at a focal organisation were quantified by pairing consumption data with
environmental databases containing life-cycle biodiversity impacts of specific food products.
Stage 2: A series of biodiversity targets were defined, including ones aligned with a nature-positive target, and annual impacts under
each target scenario were modeled in terms of changes to annual and cumulative biodiversity impacts.
Stage 3: The feasibility and technical potential of interventions to mitigate impacts were assessed based on Stage 1 quantifications
and on qualitative interview data gathered from key stakeholders at the focal organisation.
Stage 4: Five mitigation strategies were explored by combining sets of interventions, outlining the risks/feasibility for each strategy,
and quantifying potential progress towards different targets - highlighting the challenges around achieving Nature Positive targets
(e.g., Biodiversity Net Gain) at an organisational level within the current food system.
Research sample Stage 1 consumption data consisted of 4,651 purchase records for individual products, including 1,612 unique food products. Each
product in the dataset included information on date, supplier, product code and description, number of units purchased, and cost
per unit. Data was gathered from three months (September 2018, February 2019, and July 2019)
Environmental datasets included biodiversity impact and carbon dioxide equivalent (CO2e) values for 55 raw food ingredients
provided by Poore & Nemecek (Science, 2018) and for extracts of 2,138 food products and 3,687 food 'shelves' listed in foodDB (data
provided by and described in Clark et al., 2022, PNAS). The foodDB extracts consisted of a specific subset of product categories
(including composite/'ready-made' meals as well as specific plant-based meat alternatives), aggregated at both product and
supermarket 'shelf' level. FoodDB data was provided under license from the authors (Harrington et al., 2019).
Stage 3 qualitative data (in the form of interview notes) were gathered from interviews from a sample of three targeted interviewees
at the focal organisation.
Sampling strategy Stage 1 consumption data was gathered for three representative months and then factored up to represent a year. Three months
were selected on the basis of consultation with stakeholders to ensure adequate representation of the different aspects of the
organisation's food operation while enabling a feasible level of manual data handling. These three months' of data were then
factored up to represent a year using a financial breakdown of organisational spending per operational area for the purposes of
establishing a single-year fixed baseline.
Stage 3 interviewees were selected using targeted/purposive sampling. Interviewees were limited to those meeting the required
- Adults aged ≥18 years
- Able to speak and read English
- Having direct responsibility for management of the organisation's food operations
- Knowledge of the organisation's finances
- Having some interaction with the wider organisation's governance structures
Exclusion criteria: Unable or unwilling to provide consent for interview
Stage 3 interventions were collated from a non-systematic review of the literature. The search strategy involved identifying existing
systematic academic reviews of food consumption-related behaviour-change interventions, along with key sources of grey literature,
and expanding the search following a snowball sampling strategy (following references and citations) until no significantly new
additional intervention categories were able to be identified.
Data collection Stage 1 consumption data (food sales and purchase data) was provided directly by an authorised individual at the focal organisation
Stage 1 Environmental data was obtained directly from the authors of the relevant studies (Poore & Nemecek, 2018, Science;
Chaudhary et al., 2015, Environ. Sci. Technol; Clark et al., 2022, PNAS)
Stage 3 data was collected by the authors (C. Stewart) by conducting, recording, and transcribing interview notes.
Timing and spatial scale Consumption data covers three months over the 2018/19 academic year (September 2018, February 2019, and July 2019).
Consumption data relates to food prepared and consumed within the focal organisation.
Interviews were conducted in February 2020.
Data exclusions No data were excluded.
Reproducibility This study was exploratory, rather than experimental. Anonymised data/code for reproducibility of the impacts analysis can be
nature portfolio | reporting summary March 2021
Reproducibility provided (code is available from Clark et al., 2022, PNAS) however non-anonymised data extracted from foodDB cannot be provided
without license due to legal requirements.
Randomization Food consumption data was allocated to food products in environmental datasets based on the greatest degree of similarity between
products. Products were then allocated to food categories based on food group/composition. Randomisation was not relevant to this
Blinding Interviews were recorded anonymously. Interview notes were applied in this study by a different individual to the interviewer, with
no way to link specific notes to the identity of single interviewees.
Did the study involve field work? Yes No
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Population characteristics Three adult males (>18 years), able to speak and read English. All were employed by the focal organisation and had direct
responsibility for management of the organisation's food operations, knowledge of the organisation's finances and were
engaged with the wider organisation's governance structures.
Recruitment Participants were targeted through purposive sampling via email from a small number of individuals within the organisation
that fit the inclusion criteria (described in 'sampling strategy' above)
Ethics oversight University of Oxford’s Central University Research Ethics Committee (CUREC Reference number: R68035/RE002)
Note that full information on the approval of the study protocol must also be provided in the manuscript.
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