Despite increasingly militarized borders, wealthy nations can’t keep out the real enemy: climate change. While Europe and the U.S. build more walls, design more sophisticated surveillance systems, and add more armed guards to protect national security, their focus on keeping out migrants misses the fact that what needs resolving is the high level of green-house gases that are making many parts of the world impossible to live in. Miller’s eye-opening humanitarian report takes us through the “dry corridor” of Central America, the post-typhoon Philippines, and the American Southwest, documenting the plight of today’s growing numbers of climate refugees. Calling the environment “the new human rights battleground,” Miller shows that we urgently need a legal framework for people displaced by droughts and floods, not more rigorous policing. Best of all would be diverting resources from borders to develop alternatives to the unsustainable consumer society that fueled climate change in the first place.