Finalist for the 2021 PEN/E.O. Wilson Literary Science Writing AwardALibrary Journal Best Science & Technology Book of 2020APublishers WeeklyBest Nonfiction Book of 20202020 Goodreads Choice Award Semifinalist in Science & TechnologyA prize-winning journalist upends our centuries-long assumptions about migration through science, history, and reporting--predicting its lifesaving power in the face of climate change.The news today is full of stories of dislocated people on the m