One and done? Exploring linkages between households' intended adaptations to climate-induced floods

Assessing key behavioural theories of drought risk adaptation: Evidence from rural Kenya

The Horn of Africa Drylands are increasingly experiencing severe droughts, which impose a threat on traditional livelihood strategies. Understanding adaptation behavior in rural communities is key to helping reduce the impact of these droughts. We investigate adaptation behavior by assessing four established economic and social psychological theories on decision making under risk: expected utility theory (EUT), rank dependent utility theory (RDU), protection motivation theory (PMT), and theory of planned behavior (PMT). To measure adaptation behavior and the theory constructs, we conducted a household survey in Kenya (N = 502). Regression analysis shows that the economic theories (EUT and RDU) have the best fit for our data. Risk and time preferences are found to play an important role in adaptation decisions. An analysis of differences in decision making for distinct types of adaptation measures shows that risk averse (agro-)pastoralists are more likely to implement adaptation measures that are adjustments to their current livelihood practices, and less willing to invest in adaptation measures that require a shift to other livelihood activities. Moreover, we find significant effects for elements of the social psychological theories (PMT and TPB). A person's belief in their own ability to implement an adaptation measure (perceived self-efficacy) and adaptation by family and friends are important factors in explaining adaptation decisions. Finally, we find that the type of adaptation measures that people implement is influenced by, among others, gender, education level, access to financial resources, and access to government support or aid. Our analysis gives insights into the drivers of individual adaptation decisions, which can enhance policies promoting adaptation of dryland communities.

From believing in climate change to adapting to climate change: The role of risk perception and efficacy beliefs

Are people more inclined to adapt to climate change if they believe that climate change is real, caused by human behavior, and/or brings negative consequences? Previous studies provided inconclusive results on the relationship between climate change perceptions and adaptation behavior. Using a longitudinal approach, we examined whether risk perception, self-efficacy, and outcome efficacy play a role in how and when climate change perceptions are associated with adaptation to pluvial flooding and heat stress in the Netherlands. As expected, stronger climate change perceptions were associated with stronger perceptions of climate-related risks, which in turn lead to stronger intentions to implement adaptation measures. Yet, neither climate change perceptions nor risk perception were associated with whether people had actually implemented adaptation measures during a 1-year period. Contrary to common assumptions in the literature, higher levels of perceived self-efficacy and outcome efficacy did not strengthen the relations between climate change perceptions and adaptation intentions and behavior. Rather, higher levels of self-efficacy and outcome efficacy were directly related to stronger intentions to take adaptive measures and taking those measures within a period of 1 year. Exploratory analyses offered initial support for a sequential model where climate change perceptions lead to higher levels of perceptions of specific climate-related risks, which in turn lead to stronger self-efficacy and outcome efficacy, ultimately increasing adaptation intentions, but not actual behavior. Strategies to promote adaptation behavior could aim to remove behavioral barriers to increase self-efficacy, and strengthen outcome efficacy, enabling people to act on their climate change perceptions.

Uncertainty in individual risk judgments associates with vulnerability and curtailed climate adaptation

Risk assessments are key for the effective management of potential environmental threats. Across probabilistic phenomena, climate change is an exemplar of paramount uncertainties. These uncertainties have been embraced in supporting governments' decisions; yet receive scarce attention when studying individual behavior. Analyzing a survey conducted in the USA, China, Indonesia, and the Netherlands (N=6242), we explore socio-economic, psychological, and behavioral differences between individuals who can subjectively assess risks, and those who are risk-uncertain. We find that risk-uncertain individuals are more likely to belong to societal subgroups classically considered as vulnerable, and have reduced capacities and intentions to adapt to hazards-specifically floods. The distinctions between risk-aware and risk-uncertain individuals indicate that ignoring differences in individuals' capacity to assess risks could amount to persistent vulnerability and undermine climate-resilience efforts. While we use floods emblematically, these finding have consequences for the standard practice of dropping or bootstrapping uncertain responses, irrespective of the hazard, with implications for environmental management.