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Climate change adaptation by individuals and households: A psychological perspective

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Abstract

As global temperatures increase, so do the frequency and severity of various natural hazards. Worldwide, climate change can influence incidences of natural hazards such as wildfires, flooding, heatwaves, droughts, vector-borne diseases, and mudslides. Such events can be deadly, traumatizing, and cause significant economic damages. Climate change adaptation, defined as the process of adjustment to reduce or avoid the negative impacts of climate change, is therefore of critical importance. So far, the scientific literature on adaptation to climate change and climate change adaptation policies have overwhelmingly focused on the role of governments. However, the efforts of governments alone will not be sufficient to reduce or avoid the negative impacts of climate change. Climate change adaptation will need to take place at all scales, including the private sector and civil society. Private individuals and households will also need to take measures to reduce the risks of the negative impacts of climate change.8 In this background paper, we will focus specifically on the role of individuals and households in the process of climate change adaptation.
As global temperatures increase, so do the frequency and severity of various natural hazards.1 Worldwide, climate
change can inuence incidences of natural hazards such as wildres, ooding, heatwaves, droughts, vector-borne
diseases, and mudslides.2 Such events can be deadly, traumatizing, and cause signicant economic damages.
Climate change adaptation, dened as the process of adjustment to reduce or avoid the negative impacts of climate
change3, is therefore of critical importance.
So far, the scientic literature on adaptation to climate change and climate change adaptation policies have over-
whelmingly focused on the role of governments. However, the efforts of governments alone will not be sufcient
to reduce or avoid the negative impacts of climate change.4,5 Climate change adaptation will need to take place at
all scales, including the private sector and civil society.6,7 Private individuals and households will also need to take
measures to reduce the risks of the negative impacts of climate change.8 In this background paper, we will focus
specically on the role of individuals and households in the process of climate change adaptation.
While adaptation by individuals and households can be highly effective in reducing the impact of climate-related
hazards, many people are not (yet) engaging in adaptive behavior, or they are taking insufcient or inappropriate
measures to adapt. For example, in an Australian study, fewer than 30% of the respondents had a household emer-
gency kit, evacuation plan, or had installed rainwater tanks to reduce the impacts of drought.9 In a survey among
more than 1,000 rural Czech residents, 58% of households had implemented no adaptive measures against ooding,
(e.g., moving possessions to higher stories, changing oor material, or using ood barriers); only 5.5% of households
had implemented more than three adaptive measures.10 In a study on wildre preparedness in the United States,
almost all homeowners cleaned surfaces/gutters to avoid the accumulation of needles and leaves, but less than half
CLIMATE CHANGE ADAPTATION
BY INDIVIDUALS AND HOUSEHOLDS
A PSYCHOLOGICAL PERSPECTIVE
A.M. van Valkengoed & L. Steg, Faculty of Behavioural and Social Sciences, University of Groningen
BACKGROUND PAPER
About this paper
This paper is part of a series of background papers commissioned by the Global Commission on Adaptation
to inform its 2019 flagship report. This paper reflects the views of the authors, and not necessarily those of the
Global Commission on Adaptation.
Suggested Citation: van Valkengoed, A.M., and Steg, L. 2019. Climate change adaptation by individuals and
households: A psychological perspective. Global Commission on Adaptation Background Paper.
Available online at www.gca.org.
2 September 2019
had obtained additional information on wildre prepared-
ness, and just over 20% had attended community meetings
on wildland re.11 A study conducted in Bangladesh found
that over 75% of participants had received warnings from
the government to seek shelter before the onset of Cyclone
Sidr, but only 33% chose to do so.12
Since many people are not yet adapting adequately to
the effects of climate change, motivating people to adapt
represents a key challenge to successful adaptation. To
develop effective strategies to promote adaptive behavior,
the following steps are important:
1) Identify which changes in behavior are needed to
adapt adequately to the risks of climate change
2) Examine which factors affect (mal)adaptive behavior
3) Design interventions to promote adaptive behaviors
by targeting the relevant antecedents of the behavior
4) Evaluate the effects of the interventions on anteced-
ents and behavior, and adjusting intervention strategies
when appropriate.13
We structure this background paper in accordance with
these steps identied in the behavioral change literature.
First, we discuss why involving citizens and households
is critical for successful adaptation to climate change.
Second, we give an overview of the behaviors that individ-
uals and households can engage in to adapt to climate-re-
lated hazards. Third, we review the psychological factors
that motivate or hinder people to engage in these adaptive
behaviors. Importantly, we focus on explaining adaptive
behavior, that is, the behavior that people engage in to
reduce the risks of climate-related hazards. We do not
focus on adaptive capacity, which is the ability to adapt.14,15
Fourth, we show how interventions and policies can pro-
mote adaptation by individuals and households by target-
ing the key antecedents of adaptive behavior.
We note here that, while the focus of this paper is on
psychological factors, it is important to keep in mind that
individual behavior is also conditional upon the context in
which it is embedded, which includes institutional, societal,
cultural, legal, and physical factors.16-18 Long-lasting and
wide-spread behavioral change at the individual level may
thus also require changes at the systemic level.19 We will
come back to this point in the conclusion of this paper.
1. Why Are Individuals and
Households Important for
Successful Adaptation?
Individuals and households have rarely been considered
in the implementation of climate change adaptation
policies.20 For example, the United Kingdom’s National
Adaptation Programme states: ‘if adapting to climate
change is in the private interests of an individual… then it
should occur naturally and without the government’s inter-
vention.21,22 An examination of adaptation policies from
402 cities around the world also showed that the majority
of the adaptation policies examined do not specify any
consideration of, or interaction with, citizens.23 Within the
scientic literature on climate change adaptation, individ-
uals and households are often also overlooked as relevant
actors.24-26 This is unfortunate, as there are three main rea-
sons why individuals and households are of critical impor-
tance in successful adaptation to climate change.
First, due to the increases in climate-related hazards,
governments will become overstrained in their capacity
to adequately respond to these hazards.27,28 Therefore,
governments cannot guarantee full reduction of the risks
of climate-related hazards, and individuals will still be at
risk of many climate-related hazards if they do not under-
take adaptive measures themselves (see Box 1). In order to
reduce strain on government resources and to effectively
reduce the risks from the impacts of climate change, it is
necessary that individuals take adaptive measures too.29,30
Second, adaptation actions by households are effec-
tive to reduce the negative impacts of climate-related
risks and are relatively cost-efcient to implement. For
example, clearing vegetation in a 10 to 20 meter (30 to
60 feet) parameter around one’s house can increase the
survivability of a house during a wildre to approximate-
ly 90%.31 Behaviors to reduce the impact of heatwaves,
such as wearing light clothing and using cooling devic-
es, signicantly reduces mortality for elderly, even when
accounting for other risk factors such as illness and lack of
mobility.32 Examples from the United Kingdom33, France34,
Germany35,36, and India37 show that ood-proong (i.e.,
installing measures to avoid oodwaters from entering the
house) can be a cost-effective way to reduce the impacts
of ooding. Individual adaptation actions can therefore
Climate change adaptation by individuals and households 3
contribute signicantly to reducing the impacts of cli-
mate-related hazards, against relatively low costs.
Third, the adaptive actions of individual citizens can inu-
ence the effectiveness of governmental adaptation policies.
For example, government plans to renovate a street in
Quebec City in Canada motivated residents to plant trees
and ‘green’ the urban environment.38 In response to the suc-
cess of this citizen-led initiative, the city set up a program for
urban greening and reviewing roadwork practices39, resulting
in the implementation of more climate adaptive policy. In
Dutch cities, approximately 50 to 70% of the total surface
area is privately owned.40 Policies to reduce pluvial ooding
and urban heat island effects through green infrastructure
will therefore only be effective if private homeowners are
also actively involved in implementing such measures.
Conversely, if individuals fail to adapt, they can hinder or
obstruct the effectiveness of adaptation policies by gov-
ernments.41 For example, citizens that do not implement
adaptive measures may demand immediate assistance
from local governments during disasters, which can block
emergency lines and complicate effective institutional
response to an ongoing hazard.42
2. What Does Adaptation at
Individual and Household
Level Look Like?
There are many actions that people can take to reduce the
risk of climate-related hazards.57 Yet, what constitutes suc-
cessful adaptive action depends on the context in which
the behavior takes place. For example, removing trees may
reduce the risks of wildre in one context, but increase the
risk of ooding in another. In general, adaptive actions can
serve four different purposes: hazard reduction or avoid-
ance, vulnerability reduction (reducing susceptibility to be
affected by a hazard), preparedness for response (mea-
sures to respond to an ongoing hazard), and preparedness
for recovery (measures to bounce back after a hazard).58
To make these four categories more concrete in the con-
text of individuals and households, we present a catego-
rization of 6 types of adaptation behaviors performed by
individuals and households that have been studied in the
psychological literature: information seeking, preparative
measures, protective measures, evacuation/migration,
purchasing insurance, and political action.59 As we will see,
these 6 categories of behaviors can address the four aims
of adaptive behavior (see 60, for further examples of adap-
tive behavior by individuals and households).
Information seeking can increase people’s knowledge of cli-
mate change and how to adapt, which is often considered
an important condition that needs to be satised before
people can engage in other adaptive behaviors.61 For
example, people can look up information about whether
they are exposed to a hazard, what they can do to reduce
the impacts of a hazard, or monitor on-going circumstanc-
es during the approach or occurrence of a natural hazard.
Such information can help people adapt. For example,
heat warning systems can reduce heat-related mortality.62
Climate and weather information services can also help
farmers make adaptive decisions.63 However, providing
people with information is, in many cases, not sufcient to
promote adaptation, as we will discuss later in this review.
The aims addressed by information seeking are hazard
reduction or avoidance, vulnerability reduction, prepared-
ness for response, and preparedness for recovery.
Preparative measures consist of actions that people can
take before the onset of a climate-related hazard to reduce
possible negative impacts. For example, installing ood
covers over airbricks in a wall can prevent oodwater from
entering the house.64 People can install hurricane shutters
that can be closed during a hurricane to prevent damage
to windows from ying objects.65 The effects of drought
can be managed by using rainwater harvesting systems.66
To reduce the impacts of heatwaves, people can paint
their house in lighter colors to reect some of the heat
and lower indoor temperatures.67 As these actions need
to be taken before a hazard occurs, preparative actions
require deliberate planning, and may incur nancial costs.
The aims addressed by preparative measures are hazard
avoidance or reduction, vulnerability reduction, and pre-
paredness for response.
Some preparative actions are more effective if they are
implemented at the community level. For example, the
risks of local ooding caused by rainwater runoff in urban
areas can be reduced by replacing bricks and concrete
in private gardens with soil and plants. This measure
becomes more effective if more people implement it.68
Community actions to reduce malaria (for example by
clearing mosquito breeding sites) have also found to be
effective.69 Community actions can also involve helping
others to implement adaptive measures.70
4 September 2019
Protective measures refer to the actions taken during a
climate-related hazard to avoid damages or injuries. For
example, people can place sandbags in front of their door
or other openings in the house to prevent oodwater from
entering71, avoid ooded areas while driving a vehicle72,
or reduce water use during a drought.73 Some actions
may require deliberate planning, for example using insec-
ticide-treated nets and taking preventive medicine to
reduce the chances of being aficted by malaria.74 Other
actions may be more intuitive, such as reducing activity
or seeking out cool places during a heatwave.75 Protective
measures can also be prosocial, such as warning others
of an impending hazard76 or checking up on friends and
neighbors during a hazard to ensure their whereabouts
and safety.77 This can be especially important for vulner-
able populations such as the elderly, who are less able to
adapt by themselves.78 The aims addressed by protective
measures are vulnerability reduction, preparedness for
response, and preparedness for recovery.
Evacuation or migration from an area can be an effective
way of reducing the impacts of hazards such as ooding,
hurricanes, and wildres. While governments often recom-
mend or even order evacuation, people may fail to heed
Climate change poses a wide array of concrete risks for the health and well-being of individuals and households.43
Individuals and households therefore play a central role in climate change adaptation. Some of the projected
impacts of climate change that people may face at different degrees of global warming include:
Flooding: At 1.5 °C of global warming, the number of people affected by ooding is expected to double com-
pared to current levels.44
Sea-level rise: At 2 °C of global warming, sea-level rise will cause lands to be permanently ooded in 2150 that
now are home to 60 million people.45
Drought: 195 to 277 million more people than today (especially urban populations) will be affected by drought
when global temperature increases with 2 °C.46 The availability of freshwater will decrease by up to 30% under
a 2 °C global temperature increase.47
Hurricanes: The expected damage of hurricanes due to climate change will double in 2100 compared to cur-
rent levels.48 Tropical cyclones could form in regions where they have not been recorded before, such as the
Persian Gulf.49
Heatwaves: By 2100, 48% (under conditions of strong mitigation) to 74% (if no mitigation takes place) of
the world’s population could be exposed to conditions of deadly heat (i.e., a combination of critical heat and
humidity levels where exposure can lead to fatality) for more than 20 days a year.50
Wildres: Wildre potential is expected to increase in the United States, South America, southern Europe, south-
ern Africa, Australia, and Central Asia when global temperatures increase.51
Vector-borne disease: The region inhabited by mosquitos transmitting diseases such as malaria, dengue,
yellow-fever, amongst others, will expand when global temperature increases, exposing an increasing number
of people to these diseases.52,53 For example, 6.1 million additional yearly cases of dengue fever are expected in
Latin America by 2050 under 2 °C of global temperature increase.54
Loss of coral reefs: 99% of coral reefs will disappear under 2 °C of global temperature increase.55 The loss of
coral reefs will make coastal communities more vulnerable to sea-level rise and ooding and will have negative
economic impacts for sheries and tourism industries.56
BOX 1 Individuals and households at risk of climate change.
Climate change adaptation by individuals and households 5
these instructions.79 People may not want to evacuate for a
variety of reasons, such as the fear of looters or not want-
ing to leave behind pets that are not allowed in evacuation
centers.80 Financial resources can also prevent people
from evacuating; some people may not be able to take
time off work or lack the resources to travel.81 In collectivist
cultures, previous negative impacts at the community level
(rather than the individual level) may also be an important
predictor of evacuation.82 Furthermore, previous experi-
ences with unnecessary evacuation can reduce people’s
intention to evacuate in the future.83,84
The impacts of climate change can also render areas
permanently uninhabitable. For example, increases in tem-
perature and humidity could cause conditions that exceed
the human body’s capacity to cool down in regions in the
Middle East, India, and Bangladesh.85,86 Some atoll islands
that are part of Small Island Developing States (such as the
Marshall Islands, Maldives, and Seychelles) could become
uninhabitable due to rising sea levels and wave-driven
ooding.87 In such cases of slow-onset but chronic cli-
mate hazards, migration (i.e., permanent relocation) may
be required. While migration has been recognized as an
important adaptive strategy by some88-91, others are more
critical as to whether migration constitutes successful
adaptation, describing migration as a failure to adapt.92,93
For example, migration may have negative impacts, such
as the losses in cultural heritage and severing important
people-place relationships94, which may have differential
impacts on men and women within the same house-
hold.95,96 Migration may therefore not be preferred by all
communities or individuals, but may be necessary if certain
areas become uninhabitable. The aim addressed by evacu-
ation and migration is hazard reduction or avoidance.
The purchase of insurance can form an effective strategy to
reduce economic losses from climate-related hazards by
distributing the risk among policyholders.97,98 Insurance is
used as a measure of preparedness for recovery, but can
also have other benets. For example, the Kilimo Salama
FIGURE 1 Categories of adaptive behavior at the level of individuals and households.
Source: Authors.
6 September 2019
microinsurance program implemented in Kenya and
Rwanda resulted in 16% more earnings for insured farm-
ers compared to their non-insured counterparts.99 Insured
farmers were more willing to invest their savings into farm
productivity, as they no longer needed to save money for
recovering from climatic shocks. This also resulted in the
uptake of more adaptive farming practices.100
However, insurance also has its limits as an adaptive
strategy, since it does not reduce the risks of the physi-
cal or emotional impacts of hazards.101 Insurance is also
not available to many people in developing countries, as
the know-how to calculate probabilities and set up insur-
ance policy prices may not be available to their govern-
ments.102,103 An increase in natural hazards due to climate
change may increase premiums signicantly and therefore
make insurance unaffordable or even make particular
properties entirely uninsurable.104,105 Insurance may also
decrease people’s motivation to engage in the other types
of adaptive actions discussed here106, or could lead to
maladaptation. For example, government-subsidized ood
insurance may lead to the continued occupancy of ood-
plains, which exposes many people to the risks of ood-
ing.107 Insurance may therefore not always be an effective
adaptation strategy. The aim addressed by insurance is
preparedness for recovery.
Political action refers to active citizen involvement in
political processes regarding climate change adaptation.
Predominantly, climate change adaptation has been man-
aged by governments at the local, regional or national level.
In democratic countries, citizens can take political action
to promote adaptation, for example by voting in favor of
climate change adaptation policies or supporting parties
that put climate change adaptation on the agenda and
are likely to implement adaptation policy. People can also
try to inuence policy by, for example, contacting national
or local politicians, attending meetings with local govern-
ment ofcials, or engaging in different forms of collective
action, such as signing a petition.108 We will also discuss
public participation in decision-making later in this review.
The aims addressed by political actions are reducing or
avoiding hazards, vulnerability reduction, preparedness for
response, and preparedness for recovery.
Knowledge gaps
The overview presented here summarizes adaptive behav-
iors that have been studied in the literature and may there-
fore not fully cover all types of actions that are important
for successful adaptation.109 For example, psychological
adaptation to climate change, that is, effectively coping
with the stress and anxiety associated with climate-relat-
ed hazards, can be an important adaptive response.110,111
Moreover, some adaptive responses are unique to a partic-
ular group, such as farmers’ use of livelihood diversication
and adaptive farming strategies.112 Maladaptive behaviors,
such as denial of the problem, wishful thinking, and fatal-
ism, that are likely to inhibit or obstruct successful adap-
tation, are under-researched and commonly overlooked.113
This represents an important knowledge gap, as research
suggests that the drivers of maladaptation may be differ-
ent from the drivers of adaptive behavior.114
3. What Motivates People to
Adapt?
A meta-analysis that summarized the results of more than
100 studies identied various motivational factors that can
encourage or inhibit individuals’ and households’ adap-
tation to climate change115; we will summarize the most
relevant insights below.
Knowledge
Policy makers often assume that people do not adapt to
climate change because they lack information; they hold
the assertion that if people were aware of the risks of a
hazard and how to adapt, they would undertake the nec-
essary measures to adapt.116 Yet, a meta-analysis found
only a weak positive relationship between knowledge and
adaptation.117 Similarly, studies show that providing infor-
mation is often not sufcient to motivate people to under-
take adaptive measures.118 Hence, while having knowledge
about climate-related hazards and adaptive actions may be
a necessary factor for adaptation, it is often not sufcient
to motivate people to engage in adaptive actions.
Climate change adaptation by individuals and households 7
Risk perceptions and negative
emotions
Risk perception refers to a judgment that people make of
the probability and severity of a particular hazard.119 Such
judgments are subjective and can vary from person to
person; while one person may nd a particular hazard quite
risky, another may not nd it risky at all. A meta-analytic
summary showed that, overall, the more people perceive
risks of climate change and climate-related hazards, the
more likely they are to implement adaptive measures, but
the pattern of results was highly variable across studies.120
Specically, while some studies found that people who
perceive more risks are more likely to implement adaptive
measures, other studies found no signicant relationship
between risk perception and adaptation.121 Importantly, risk
perception was more strongly related to intended behaviors
than to behaviors that had already occurred in the past.122
This is likely because people felt less at risk after they
implemented adaptive measures.123
People may also respond emotionally to a climate-related
risk.124 Such emotional and affective reactions appear to
play a role in adaptation to climate change. For example,
in a survey conducted in Switzerland and Great Britain,
respondents who had a stronger negative emotional
response to climate change were more likely to support
adaptation policies.125 Especially concern about climate
change or climate-related hazards has been found to
be consistently related to adaptation.126 For example,
people that were more concerned about climate change
were more likely to support adaptation policies.127,128
Interestingly, negative emotions (e.g., concern, fear) are
generally more strongly related to adaptive behavior than
risk perception.129
FIGURE 2 Key psychological variables that play a role in climate change adaptation.
Source: Authors.
8 September 2019
Perceived efcacy: Can I do it and
will it help?
As indicated above, perceiving a risk may not be suf-
cient to motivate people to undertake adaptive measures.
People also need to believe they are capable of engaging
in adaptive measures, and that such measures will be
effective in reducing or avoiding the risk.130,131 Two types
of efcacy are relevant in this respect. Self-efcacy refers
to whether people think they are capable of implement-
ing a particular adaptive behavior or course of action.132
Importantly, it refers to people’s perceived capability, and
therefore differs from (but is related to) adaptive capacity,
which reects people’s objective capabilities to adapt to
climate change.133 Self-efcacy can play an important role
in whether or not people undertake adaptive actions. For
example, coastal residents in Cambodia who had more
condence in their personal abilities to adapt were more
likely to engage in adaptive actions.134 People who had
more condence that they were able to do what is need-
ed to evacuate were more likely to report the intention to
evacuate in the event of a hurricane.135 Self-efcacy was
also positively associated with taking preventive measures
against malaria, such as using insect repellent and wearing
long-sleeved clothing at night.136
Outcome efcacy reects whether people perceive an
action to be effective at reducing the risks from climate-re-
lated hazards.137 This is important, as perceiving a measure
as ineffective can demotivate people to undertake such a
measure in the rst place. For example, an interviewee in
Canada who had just lost their home in a wildre said the
following about using re-resistant building materials:
So ... it makes no difference whether the outside [of the
house] is clad in cedar or everybody you see has got
plastic, which melts, and as soon as it melts it’s just
back to cedar ... You know, not allowing the homeowner
to do what they want and then the end result it wouldn’t
make a darn good of difference, because we had a
cement block house and it blew apart.138
This respondent was not planning to rebuild their house
using re-resistant materials because they perceived this
measure to be ineffective. On the other hand, perceiving
high outcome efcacy of a measure may increase the
likelihood of implementing it. Indeed, a higher perceived
outcome efcacy was found to be associated with
more preparedness for ooding139,140, wildres141,142, and
drought143,144. In fact, outcome efcacy has been found to
be overall one of the key motives for adaptive behavior.145
The inuence of other people
Perceptions of what other people are doing, referred to as
‘descriptive norms’146, play a role in the process of adapta-
tion to climate change. For example, people were more like-
ly to purchase ood insurance if they thought that others
would buy it too.147 Sri Lankan farmers who perceived that
other farmers were engaging in adaptive farming practices
were more likely to report the intention to engage in these
practices.148 Similarly, seeing neighbors evacuating and
businesses closing during a hurricane motivates people to
evacuate.149
People are also sensitive to what they believe others expect
them to do, reecting ‘injunctive norms’.150 Injunctive norms
can inhibit or promote adaptation, depending on whether
people believe that others approve or disapprove of adap-
tation. For example, a study in Australia found that people
who thought others expected them to get a rainwater tank
had stronger intentions to install one.151 Similarly, in China,
people who perceived that their friends, family, and com-
munity expected them to prepare for ooding were more
likely to do so.152 On the other hand, a British interviewee
said the following about why she did not want to imple-
ment ood-protection measures in her house, even though
she had been affected by ooding in the past:
I think we don’t really want to […] change it—I like my
house to look nice—I don’t want to have a door that is
like a bit daft because I raise the [doorway]. And each
time when we have friends or people coming through,
you say well, you know, ‘can you please step higher’’
That just, um—I don’t know.153
The idea of raising the doorway was unappealing to this
respondent because she worried that it would make her
house look ‘a bit daft’ and that it could inconvenience
guests. A sherman in India said the following about why
he did not want to use hand-held cast nets or crab traps,
which could be an effective adaptive strategy to supple-
ment and diversify the income gained from using a more
traditional, large-scale shing method called ‘Padu’:
It is our birth right to have a productive lagoon and Padu
system, rights which should not be compromised by
adopting shing styles of lower status shermen.154
Climate change adaptation by individuals and households 9
This sherman perceived the smaller scale shing meth-
ods as behavior that is associated with a lower status
group, and that there is a strong social norm that people
from a high social status group do not adopt this behavior.
Another study also found that people who thought family
members would not like the idea of wildre preparation
were less likely to take preparatory measures such as
clearing foliage around the house.155 Overall, both injunctive
and descriptive norms appear to be an important inuence
on adaptation behavior.156
Responsibility
Perceived responsibility refers to the extent that people
believe they themselves are responsible for taking adaptive
measures. The lack of feeling a personal responsibility to
reduce the risks of climate-related hazards has been recog-
nized as an important barrier to successful adaptation.157
Research suggests that many people seem to accept, at
least, some responsibility to adapt to climate change. For
example, a Dutch study found that most people perceived
an equal distribution of responsibility to adapt to ooding
between themselves and the government.158 Similarly,
most respondents of a study conducted in Colorado,
United States, perceived moderate or great responsibility
to prevent wildres.159 In contrast, a study conducted in the
UK found that most interviewees perceived the government
as responsible for preventing ooding; they rejected their
own responsibility as they did not perceive themselves as
capable of avoiding the impacts of ooding.160 Perceived
responsibility may therefore be related to perceived self-ef-
cacy; if people perceive low self-efcacy to adapt, they
may also reject their personal responsibility to adapt.
Overall, people who perceive more responsibility for adapt-
ing are more likely to engage in adaptive behavior.161-164
If people deny personal responsibility and perceive gov-
ernments as primarily responsible, they are less likely to
implement adaptive measures.165
Knowledge gaps
We have reviewed whether knowledge and different psy-
chological motives play a role in adaptive behavior. Yet, the
literature on this topic is still very much in development,
and many questions remain to be addressed. Notably,
some motivational variables have been studied much more
extensively than others. For example, while risk perception
and experience with climate-related hazards have been
studied frequently in the literature, there is little research
on the effect of descriptive and injunctive norms in adap-
tation.166 The question therefore remains how robust the
effects of social norms on behavior are, since our review
was based on relatively few studies.167 In a similar vein,
some types of adaptive actions, such as preparative
measures, have been studied more extensively than others,
such as migration.168 More research is therefore needed
on how different psychological motives relate to different
types of adaptive actions.
Moreover, the effects of different motivational factors on
adaptive behavior are not consistent across studies.169
Future research is needed to understand under which
conditions different psychological motives may be more or
less predictive of adaptive actions. For example, it may be
that the predictive power of different motives varies across
different types of adaptive behaviors or different types of
climate-related hazards.170 Most of the studies have also
been conducted in the United States, Europe, and Australia
(see Figure 3), so the question remains whether similar
motives drive adaptive behavior in different countries and
cultures. Addressing this question is particularly important
as the most vulnerable populations live in the Global South,
and adaptation is therefore urgent in these regions.
Furthermore, studies have scarcely looked at how different
motivational factors are interrelated. Therefore it is not
clear how different factors jointly determine how people
adapt to climate change. Hence, future studies are needed
to gain a more comprehensive understanding of how these
motives are related, and under which circumstances partic-
ular motives may be more or less relevant. As an example
of how psychological variables may jointly explain adaptive
behavior, a study conducted in France and Germany found
that descriptive social norms may be relevant in adaptation
because people who perceived that others had already
implemented adaptive measures also perceived higher
self- and outcome efcacy of adaptive measures.171
Finally, the studies that we reviewed focused on a specif-
ic type of climate-hazard, namely acute hazards that are
expected to intensify due to climate change. However, cli-
mate change can also cause slow-onset chronic hazards,
such as rising sea levels and drought. People’s responses
to such slow-onset hazards may rely on different motives
than responses to acute hazards. Climate change may
also cause ‘novel’ acute hazards in areas that have not
10 September 2019
historically been exposed to such risks. For example,
climate change may cause malaria to migrate into new
territories.172 Studying whether the psychological motives
discussed here are also applicable to adaptation to such
‘novel’ hazards is of critical importance.173
4. How Can Individuals and
Households Be Encouraged
to Engage in Adaptation?
In addition to understanding what motivates or hinders
people to engage in adaptive behaviors, it may also be rel-
evant to know how adaptation behavior can be promoted.
Behavioral change interventions are more effective if they
target the key antecedents of the behavior they are trying
to promote.174,175 We will discuss how two strategies used
by governments (communication and public participation
in decision-making176) can promote adaptive behavior by
targeting the key antecedents of adaptive behavior dis-
cussed in Section 3.
Communication
Communication strategies are the most frequently used
strategy by governments in motivating private adaptation
to climate change.177 This mostly entails providing citi-
zens with information on climate change risks or how to
adapt.178 Examples of communication strategies include
yers providing information on how to adapt to climate
change, climate information services that provide localized
climate information for farmers, and warning systems. Yet,
as indicated above, knowledge about climate change and
adaptation was only weakly positively related to adaptive
behavior, which suggests that information campaigns
may not be very effective in promoting adaptive behavior.
Already in 1983 a literature review concluded that there
was little evidence for the effectiveness of information
campaigns to promote adaptive behavior against natural
hazards.179 A recent study in the United States found that
providing coastal residents with maps that showed how
their ZIP-code area would be affected by rising sea-lev-
els did not increase participants willingness to pay for
the implementation of adaptation policies, compared to
FIGURE 3
Source: “Meta-Analyses of Factors Motivating Climate Change Adaptation.” and van Valkengoed, A.M., and Steg, L. 2019. “The Psychology of
Climate Change Adaptation.”
Locations of the studies on factors motivating adaptation behavior reviewed in van
Valkengoed and Steg. 2019
Climate change adaptation by individuals and households 11
a control group that saw no sea-level rise information.180
Similarly, same-day exposure to television, radio, and print
information on heatwaves did not reduce heatwave-related
mortality in Indiaa.181 Hence, policy makers should be aware
that information campaigns are typically not sufcient to
encourage behavioral change.
The ndings discussed in Section 3 suggest that commu-
nications strategies may be more effective if they target
people’s perceptions of risks of and negative emotions
associated with climate change or climate-related hazards,
perceived self-efcacy, perceived outcome efcacy of
adaptive actions, injunctive and descriptive norms towards
adaptation, and perceived responsibility to adapt. Empirical
studies support this assumption. For example, a Dutch
study compared the effects of messages stating that
people were either in the 10% of the population most at
risk of ooding, or the 10% of the population least at risk of
ooding. People who saw the high-risk message reported
stronger intentions to look for information on ood reduc-
tion and to implement ood reduction measures, and were
more likely to click on links with information on ood pre-
paredness.182 This study also tested the effects of informa-
tion targeting self-efcacy and outcome efcacy. People
read an article about ood-preparedness, which either
stressed the ease and effectiveness of different ood-pre-
paredness measures (targeting self- and outcome efcacy,
respectively), or that only mentioned ood-preparedness.
People who read the article which stressed the ease and
effectiveness of ood-preparedness reported stronger
intentions to look for information on ways to reduce the
risks of ooding, to implement ood reduction measures,
and were more likely to click on the links about ood pre-
paredness, compared to people who read the article that
only mentioned ood-preparedness.
A study in Australia found that providing people with a mes-
sage stating that many people in the participants’ area had
already taken adaptation measures (targeting descriptive
norms) was more effective in promoting wildre evacu-
ation planning than giving people information on how to
prepare (targeting knowledge).183 Importantly, providing
a Interestingly, this study showed that cumulative exposure to the infor-
mation over a 7-year period did predict a reduction in heatwave-related
mortality. The effectiveness of information campaigns may therefore
depend on whether the information becomes collective knowledge after
a longer period of time. This nding may also hint towards the gradual
development of social norms surrounding heat-protection behavior that
followed as a result of yearly information campaigns.
information on how to prepare did not increase adaptive
actions compared to a control group that received no infor-
mation, again showing that simply providing information is
often not sufcient to promote adaptation.
A study in the United Kingdom found that reminding people
of the negative emotions they experienced during a previ-
ous heatwave could increase their intention to take adap-
tive measures during the next heatwave.184 In an Australian
study, more than 1,000 respondents rated the likelihood
that they would follow the advice of different real-life
adaptation campaigns. The results showed that, overall,
campaigns were most effective if they gave concrete
suggestions of appropriate adaptive behaviors (targeting
knowledge and self-efcacy), and conveyed relatively
strong negative emotional content (targeting negative
emotions).185 Combining the provision of knowledge with
appeals to other motives such as negative emotions and
self-efcacy can thus be effective in promoting adaptive
behavior. Interestingly, this study also found that people
were less likely to follow the advice in the campaigns if
the messages explicitly mentioned climate change, but
only if people were skeptical about climate change.186 For
people that were concerned about or indifferent towards
climate change, the reference to climate change in the
adaptation campaign did not inuence the likelihood that
they would follow the advice, suggesting that the role of
climate change in causing different hazards does not seem
to matter much. More generally, tailoring the content of
adaptation appeals or information to specic audiences
may increase the effectiveness of information provision
strategies.187
Overall, targeting key antecedents of adaptation behavior
appears to be an effective way to promote adaptation
behavior. One example of how an intervention was devel-
oped to target various relevant antecedents of adaptive
behavior is the ‘VisAdaptTM’ tool.188 We highlight this exam-
ple in Box 2.
Public participation in decision-
making
In addition to communicating to citizens, governments
may consider including citizens more intensively in their
decision-making processes. Citizen participation has been
described as a ‘ladder’ that consists of different levels of
public participation in governmental decision-making, rang-
12 September 2019
ing from non-participation (not listening to, nor informing
citizens), to tokenism (informing and listening to citizens,
but government takes decisions), to citizen power (yielding
power to citizens to inuence government decision-mak-
ing).194 The ladder of citizen participation considers the
communication strategies described previously as ‘token-
ism’, because they do not grant citizens power to actually
inuence governmental decision-making. True public
participation in decision-making occurs when governments
actively engage citizens in the decision-making process
by ensuring two-way communication and offering citizens
the possibility to inuence the policy or project that is to be
implemented.195,196
Policy makers may be reluctant to include citizens in adap-
tation planning, for example because they believe it is ‘too
technical for citizens to be interested in’.197 Also, municipal-
ities may not have the capacity to accommodate citizens
in adaptation planning.198 Yet, adaptation policy can benet
greatly from including citizens in its planning, for three
main reasons.199 First, citizens have a right to inuence
decisions that affect them directly. Second, citizens can
contribute important localized knowledge that can increase
the effectiveness and acceptability of the policy. For exam-
ple, if governments wish to implement measures to reduce
local pluvial ooding in a neighborhood, residents of that
neighborhood will be the most knowledgeable about which
areas in the neighborhood ooded in the past during cloud-
bursts, and can therefore advise which areas are most vul-
nerable.200 Third, by including citizens in decision-making,
people may perceive the decision-making process as fairer,
and therefore nd the overall policy more acceptable.201
Public participation in adaptation policy can also be an
important pathway to stimulating private adaptation by
individuals and households, as it can play into the key
motives of adaptive behavior introduced earlier. Inviting
citizens to participate in adaptation planning can initiate a
conversation between governments and citizens to deter-
mine each actor’s responsibilities associated with adapta-
tion. This may make citizens more aware of their personal
responsibility to adapt to climate change. Second, adapta-
VisAdaptTM is a web-page tool designed to help Nordic homeowners adapt to climate change.189 The tool aims to
address important barriers to climate change adaptation amongst Nordic homeowners. To identify these barriers,
a series of focus group interviews were held with homeowners in Sweden, Norway, and Denmark. Based on these
focus groups, ve key barriers to adaptation were identied: low levels of perceived risk, high levels of psycholog-
ical distance (the idea that climate change will happen only in the future or in faraway locations), lack of clarity
regarding what constitutes adaptation, high perceived nancial costs, and low levels of perceived responsibility.190
The VisAdaptTM tool was subsequently developed to reduce these barriers.
The tool consists of a web-page with three panels (see Figure 4). First, homeowners enter their address to visualize
their home on Google Maps, and select the relevant features of their house (e.g., having a basement, a at roof,
etc.). Second, homeowners are able to see projected local impacts of climate change in their local area. These
two panels are designed to make people aware of the local impacts of climate change and to reduce the psycho-
logical distance of climate change. In the third panel, users are shown different adaptation measures that can be
implemented around their house, highlighting the measures that are most relevant to the homeowner based on the
projected local impacts shown in the second panel and the features of the home selected in the rst panel.191 The
aim of the information shown in the third panel is to provide an overview of adaptive actions that people can take,
to demonstrate that some adaptive measures are low cost, and to highlight that these actions are the responsibili-
ty of homeowners.
Preliminary tests have shown that the VisAdaptTM tool helped homeowners to make climate change and adaptation
more personally relevant and to make adaptive actions more closely associated with day-to-day home mainte-
nance192,193, but its effectiveness in changing real-life adaptive behavior still needs to be assessed.
BOX 2 VisAdaptTM: Visualising adaptation for Nordic homeowners
Climate change adaptation by individuals and households 13
tion measures that are implemented through collaboration
between government and citizens are likely more extensive
and effective than measures implemented by single house-
holds alone, which can raise people’s perceived outcome
efcacy of adaptation measures. Public participation in
decision-making can also increase perceived autonomy
and empower citizens202, which can increase their self-ef-
cacy to further undertake individual adaptive measures.
Additionally, as mentioned previously, public participation
can increase the perceived fairness of adaptation planning,
which may increase people’s trust in the government.203
Higher trust in government has been found to be positively,
albeit weakly, associated with more engagement in private
adaptation behavior.204 Furthermore, public participation
may change perceived descriptive and injunctive norms
related to adaptation. Specically, convening a group of
citizens can establish a descriptive norm that others are
willing to engage in adaptation behavior. This may even
spread to people who are not actively participating them-
selves, but hear that different community members are
involved in adaptation planning. Similarly, if citizens are
actively involved in adaptation planning, adaptation to cli-
mate change may be perceived as part of a ‘citizens’ duty’
or a ‘community value’, which may strengthen people’s
injunctive norm that adaptation is desirable and approved
by members of the community.
Public participation may also increase the effective-
ness of communication strategies. For example, PICSA
(Participatory Integrated Climate Services for Agriculture) is
a climate information system that combines climate data
with localized knowledge using participatory approaches,
such as active discussion and joint interpretation of climate
data with trained facilitators.205 Most farmers perceived
the PICSA approach as very useful, and that it could assist
them in making adaptive decisions.206,207
Yet, public participation may have two important pitfalls.
First, participatory approaches can fail if governments
assume that a local community is a homogenous group
where all individuals have similar needs and desires208,
thereby not acknowledging diversity in demographics (e.g.,
FIGURE 4 The VisAdaptTM interface.
Source: Taken with permission from www.visadapt.info.
14 September 2019
economic status, ethnicity, gender, age209) and in political
orientation and personal values.210 Local communities typi-
cally consist of diverse stakeholders that will have different
preferences for adaptation policies, as they are likely to
benet or suffer to different extents from climate change
adaptation policies.211
Second, well-educated and wealthy citizens are more
inclined to participate.212,213 Participatory approaches could
therefore lead to an ‘illusion of inclusion’, where they serve
an already privileged group rather than the entire com-
munity.214 This can lead to ‘elite capture’, where the needs
and position of inuential actors are further reinforced and
entrenched.215
To overcome these pitfalls, it is recommended that gov-
ernments engage as many stakeholders as possible,
share information openly with all parties, engage stake-
holders in meaningful interaction, and attempt to satisfy
multiple viewpoints.216,217Adaptive measures and policies
that appeal to different kinds of values that people may
endorse, such as traditionalism, the importance of commu-
nity, and protecting the environment, may be required for
wide-spread public participation in decision-making.218,219
Knowledge gaps
We have reviewed how communication and public partic-
ipation in decision-making can promote adaptation. We
identify three key knowledge gaps in motivating adaptive
behavior. First, very few studies so far have tested which
strategies are effective to promote adaptive behavior.
The studies we discussed represent relatively small-scale
studies that relied on self-report measures. While these
results are promising, more systematic research is needed
to better understand the effects of different interventions
to promote adaptation in different contexts. Notably, to
strengthen the evidence base of adaptation policy, it is
important that such interventions are evaluated properly.
It is key to not only assess whether an intervention was
able to promote adaptation behavior, but also to examine
whether the antecedents of the behavior that were sup-
posed to be targeted by the intervention changed in the
expected direction220, and whether the impacts of climate
risks were actually reduced. Measuring changes in behav-
ioral antecedents is important in order to understand why
an intervention did (not) work, and yields important insights
into how interventions can be improved.221 Additionally,
measuring changes in the targeted antecedents can inform
theory, as it represents an experimental test of the causal
pathways within a theoretical framework.222
Second, it is not yet clear whether people’s participation in
public adaptation projects also leads to them implement-
ing private adaptation measures. One study conducted
in Sweden found that people who had interacted with the
municipality regarding adaptation matters (for example,
trying to inuence long-term urban planning or lobbying
against erosion) were more likely to implement private
adaptation measures.223 This suggests that public partic-
ipation may indeed be related to people’s private adapta-
tion behavior. However, this correlational study does not
allow drawing rm conclusions about the causality of this
relationship. That is, people who already have implement-
ed more private adaptive measures may be more likely to
participate in public adaptation projects too. There may
also be a third variable in play that motivates people to
engage in both private adaptation and participation in deci-
sion-making, such as perceived social norms or perceived
risks. Future research is required to untangle whether, why,
and under which conditions public participation can lead
to more acceptable adaptive policies as well as motivate
private adaptation to climate change.
Third, we discussed communication and public participa-
tion in decision-making as strategies to promote behav-
ioral change. Yet, other modes of city-citizen interaction
may also promote adaptation, such as nancial incen-
tives (e.g., the provision of subsidies or lowering taxes to
motivate adaptation224), social inuence strategies (e.g.,
commitment strategies, implementation intentions, using
role-models225) and other structural strategies (e.g., imple-
menting laws or removing bureaucracy in order to make it
easier for people to implement adaptive measures them-
selves).226 Future research could examine the effectiveness
of such strategies in promoting adaptation behavior by
individuals and households.
5. Conclusion
In this background paper, we discussed the role of individ-
uals and households in climate change adaptation from
a psychological perspective. The role of individuals and
households is often overlooked in climate change science
and adaptation policymaking. Yet, individuals and house-
holds have an important role to play in successful adap-
Climate change adaptation by individuals and households 15
tation to the impacts of climate change. Six categories
of adaptive behavior have been studied in the literature:
information seeking, preparative measures, protective
measures, purchasing insurance, evacuation/migration,
and political action. People are more likely to engage in
these adaptation behaviors if they: perceive higher risks
and experience stronger negative emotions from climate
change and climate-related hazards; feel that they are able
to implement adaptive measures and perceive such mea-
sures as effective to reduce climate risks; think that other
people are also adapting and that other people approve of
adaptation; and think that they are personally responsible
for undertaking adaptive measures. Adaptive behavior can
be promoted by designing interventions to target these
motives, for example via communication campaigns or
public participation in adaptation decision-making.
Based on our review, we offer the following three recom-
mendations for policy makers. First, adaptation planning
will be more successful if the behavior of individuals and
households are systematically considered. Individuals and
households can play a critical role in protecting themselves
and close others against the risks of climate change.
Additionally, individuals can contribute to the effective-
ness and fairness of adaptation policies through public
participation in decision-making. Individuals and house-
holds therefore represent an important force in the ght
against climate change risks that has so far been mostly
overlooked.
Second, there are multiple factors underlying people’s
decisions to (not) adapt and different strategies can be
implemented that target key factors to promote adaptive
behavior. Importantly, adaptation behavior is not just a
function of a person’s knowledge or perceived risks of
climate change. Rather, people are motivated or hindered
by a variety of psychological factors, such as perceived
responsibility and the perceived expectations and behavior
of others. These different psychological factors likely inter-
act and determine adaptation behavior in ways that are still
poorly understood, and which will require future studies
to disentangle. To increase the effectiveness of interven-
tions aimed at promoting adaptation behavior, systematic
monitoring and evaluation of both the target behavior as
well as the targeted antecedents of adaptation behavior are
necessary.
Third, individual adaptation is a necessary, but not a
sufcient, condition for successfully reducing the risks
of climate change. The effects of individual adaptation
will be marginal if governments and industry fail to imple-
ment large-scale, infrastructural adaptation measures. For
example, the effects of individual measures to reduce the
impacts of heatwaves will be futile if urban heat-island
effects are not addressed via climate-proof urban planning.
More generally, the behavior of individuals is determined
by the institutional, societal, cultural, legal, and physical
context in which it takes place. Attempts to change behav-
ior through informational or motivational campaigns may
therefore be futile if there are key structural or systematic
barriers to adaptive behavior. It is therefore imperative that
governments create enabling environments that support
individuals’ decision-making for effective climate change
adaptation. Overall, we hope that this background paper
will inspire more consideration for the role of individuals
and households in the overall discourse on climate change
adaptation.
16 September 2019
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Climate change adaptation by individuals and households 17
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ABOUT AUTHORS RESEARCH
INSTITUTION
The University of Groningen is an ambitious international
research university with strong roots in the north of the
Netherlands. The University creates and shares knowledge
through its outstanding research, scholarship and
education. With an academic tradition dating back to 1614
and a rich heritage, the University is a unique academic
community with a strong sense of belonging and a culture
of innovative education and research.
The Geodienst is the only organization-wide university
spatial expertise center in the Netherlands. The Geodienst
is the central point of contact for technological innovation
in the eld of applications of spatial information
technology (data, software, visualization). Multidisciplinary
specialists in the eld ofspatial computingand Geographic
Information Systems (GIS) supportscientic research with
customized software, analytics and visualisations.
ABOUT THE GLOBAL
COMMISSION ON ADAPTATION
The Global Commission on Adaptation seeks to accelerate
adaptation action and support by elevating the political
visibility of adaptation and focusing on concrete solutions.
It is convened by 20 countries and guided by more than 30
Commissioners, and co-managed by the Global Center on
Adaptation and World Resources Institute.
Copyright 2019 Global Commission on Adaptation. This work is licensed under the Creative Commons Attribution 4.0 International License.
To view a copy of the license, visit http://creativecommons.org/licenses/by/4.0/
ABOUT THE AUTHORS
Anne van Valkengoed: University of Groningen
a.m.van.valkengoed@rug.nl
Linda Steg: University of Groningen
e.m.steg@rug.nl
ACKNOWLEDGEMENTS
We would like to thank Chandni Singh (Indian Institute for
Human Settlements, India), Susan Clayton (The College
of Wooster, United States), Christine Wamsler (Lund
University, Sweden), Edith Camerink (Municipality of
Zwolle, the Netherlands), and Martine Kreuger (Municipality
of Breda, the Netherlands) for reviewing our paper and
providing us with helpful and insightful comments. We
would like to thank Steph Johnson Zawadzki (University
of Groningen, the Netherlands) for copyediting this paper.
We would like to thank the Geodienst of the University of
Groningen for providing us with the map shown in Figure 3.
... Neighbours and other actors: There are two ways that the norms of neighbours can influence people: 1. Perceptions of what others are doing (descriptive norms) 2. What they think others expect them to do (injuctive norms) [45]. Descriptive norms for greening the city are: seeing others greening (or paving) their garden, which imposes a social norm for doing the same, thus suggesting a tipping point in greening or paving. ...
... This suggests campaigning with information about the number of people that want to change (see also nudging). Van Valkengoed en Steg [45] stated that public participation may change perceived descriptive and injunctive norms related to adaptation. The work of a group of citizens can establish a descriptive norm that suggests to the general public that others are willing to engage in adaptation behaviour. ...
... Municipalities: In addition to legislation, municipalities can influence the behaviour of inhabitants in two ways: by showing a good example and by cooperation. According to Van Valkengoed and Steg [45] there are six reasons why cooperation between municipalities and inhabitants can influence their behaviour (related to sustainability): 1. ...
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... To overcome this issue, different top-down and bottom-up methods to incentivize householders into a "wildlife-friendly" management of gardens could be applied. For instance, in addition to regulation, municipalities may influence the behavior of inhabitants by showing a good example or by actively involving citizens and local associations, supporting private or community proposals on public green spaces, and helping them in defining local actions that householders can take to reduce negative impacts and implement the urban ecological framework [59,62,63]. ...
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... A very practical conclusion would be that, when aiming at fostering private precautionary measures, municipal administrations and locally active NGOs should try to establish, empower, and communicate role models of self-protective behavior in vulnerable residential areas. Such role models show their neighbors that precautionary action is feasible and can provide information about, as well as practical advice on, adequate precautionary measures, while establishing social norms for self-protective behavior [75]. ...
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