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Climate change is no longer an abstraction, as the world experiences extreme heat, rising sea levels, and brutally destructive wildfires. In Climate Fault Lines, Alexander Gazmararian and Helen Milner show that the effects of climate change are far from equal, with the most severe damages concentrated in the world鈥檚 hottest regions. They argue that this divide鈥攁 fault line that cuts across existing social, economic, and political divisions鈥攚ill produce diverging political responses to the changing climate. People, businesses, and governments on the more vulnerable side of the fault line are highly motivated to address climate change because they directly experience its intensifying effects. Those on the other side, however, have less motivation to address the problem, and when they do enact climate policy, it鈥檚 mainly for other reasons鈥攃leaner air, economic gains, or greater energy security.

Gazmararian and Milner support their argument鈥攚hich departs from the prevailing wisdom that Northern European states are climate leaders whereas developing nations are free riders鈥攂y bringing together models from economics, geosciences and political science. The data show that voters and businesses with the most to lose are reshaping the incentives and policies of local and national governments below the fault line. Unequal harm, not shared global vulnerability, increasingly informs climate politics.