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According to U.S. military planners, climate change now poses the #1 national security threat to the United States, even before terrorism. The Internal Displacement Monitoring Centre reports that a person is four times more likely to be forced to move due to environmental disaster than by war, and in 2015 alone, 19.2 million people were displaced worldwide by environmental disasters. Droughts, fires, and floods are driving ever-larger numbers of people to cross national borders, and the problem is not just the vast numbers of people on the move, but also the legions of highly militarized border armies being deployed to stop them.In fast-paced prose, Todd Miller travels to hot spots in the United States and around the globe to investigate how environmental crisis is creating millions of climate refugees who are challenging the developed world's borders and resources.