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In response to changing climatic conditions, people are increasingly likely to migrate. However, individual-level survey data reveal that people mainly state economic, social, or political reasons as the main drivers for their relocation decision-not environmental motives or climate change specifically. To shed light on this discrepancy, we distinguish between sudden-onset (e.g., floods and storms) and slow-onset (e.g., droughts and salinity) climatic changes and argue that the salience of environmental conditions in individuals' migration decisions is shaped by the type of climate event experienced. Empirically, we combine individual-level surveys with geographic information on objective climatic changes in Vietnam and Kenya. The empirical evidence suggests that sudden-onset climate events make individuals more likely to link environmental conditions to their migration decision and, hence, to identify themselves as "environmental migrants." Regression analyses support these results and are consistent with the view that slow-onset events tend to be linked with migration decisions that are more economically motivated.

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We analyze how parties respond programmatically to populist parties in power abroad. Political parties often copy the policies of governing parties in other countries-a phenomenon that contributes to waves of transnational policy diffusion. We report the first large-scale comparative study showing that populist parties in government abroad trigger the opposite reaction: instead of inspiring emulation, their highly visible governing dilemmas provoke a policy backlash by parties in other states. We argue that dilemmas arise because populist parties confront unique and debilitating trade-offs between maintaining their anti-system posture and governing effectively, which make them electorally vulnerable. Other parties observe foreign populists' governing dilemmas and respond by distancing themselves in order to avoid these problems. We detect this "foreign populist backlash effect" using spatial econometric analysis, a method that allows us to estimate international policy connections between parties, applied to over 200 European parties' programmatic positions since the 1970s. Our findings illuminate parties' election strategies and show that this backlash effect constrains the spread of populism across Western democracies.

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Terrorists aim at influencing audiences beyond their immediate victims, but can only achieve this if an attack receives sufficient public attention. Previous research shows that terrorism can affect public opinion, but these studies are mainly based on emblematic single cases and relate to varying measures of influence, which are difficult to compare. This research focuses on the first-order effect of terrorism: attention. To analyze whether terrorists get attention, we combine a quasi-experimental approach for causal identification with a comparative design. We compile data from Eurobarometer surveys and contrast responses of more than 80,000 individuals surveyed before and after five diverse Islamist attacks in Europe in 2013-2019. Attention to terrorism increases in all targeted countries, regardless of attack size. Yet, while all incidents raise attention to terrorism, only larger attacks exert a meaningful impact across Europe.

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International environmental treaties are the key means by which states overcome collective action problems and make specific commitments to address environmental issues. However, systematically assessing states' influence in promoting global environmental protection has proven difficult. Analyzing newly compiled data with a purpose-built statistical model, we provide a novel measurement of state influence within the scope of environmental politics and find strong influences among states and treaties. Specifically, we report evidence that states are less likely to ratify when states within their region ratify, and results suggesting that countries positively influence other countries at similar levels of economic development. By examining several prominent treaties, we illustrate the complex nature of influence: a single act of ratification can dramatically reshape global environmental politics. More generally, our findings and approach provide an innovative means to understand the evolution and complexity of international environmental protection.

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Several studies examining implications of the modern welfare state arrive at rather positive conclusions: generally, they find that economically "kinder, gentler societies", that is, countries providing stronger state-sponsored social-safety nets for their people, perform better on various accounts, such as social and political stability, or economic performance. Recent research suggests that benign implications also exist for the environment in the sense that investing more in social policies may contribute to stronger environmental protection and higher environmental quality. We present theoretical arguments in favor, but also against this hypothesis, and evaluate it empirically with cross-sectional data for 68 countries. In contrast to previous studies, the results offer only weak and inconsistent support for the claim that social policies and environmental performance are systematically related. This means that governments of economically kinder, gentler societies would be ill advised to hope for positive "spillover effects" of social policies into the environmental realm. The findings also suggest, however, that more disaggregated analyses are necessary, since beneficial effects may exist in some environmental domains, but not in others.

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