Among the many sobering projections of harm to be caused by climate change is this eye-popping statistic: on average, according to economists, a rise in local temperature of half a degree Celsius is associated with a ten to 20 percent increase in the risk of deadly conflict. If accurate, that means the likelihood of such strife is swiftly rising. UN climate scientists estimate that manmade emissions have generated one degree of global warming since preindustrial times, and because the pace of climate change is fast accelerating, they predict another half a degree of warming as soon as 2030. Tropical areas will have even more extreme warming, with a correspondingly higher risk of climate-related insecurity.