Natural scientists agree that the climate is changing and that humans bear some of the blame. Social scientists are now attempting to assess the economic and political price societies are likely to pay for turning up our planet’s thermostat. The security policy community is especially eager for an answer. In the academy, the debate over climate change and its security implications gained momentum after researchers from Stanford, the University of California Berkeley, New York University, and Harvard observed that civil wars were more prevalent during years that experience hotter temperatures. The chief explanation for this relationship is that higher temperatures...
