Finalist for the 2021 PEN/E.O. Wilson Literary Science Writing Award A Library Journal Best Science & Technology Book of 2020 A Publishers Weekly Best Nonfiction Book of 2020 2020 Goodreads Choice Award Semifinalist in Science & Technology A 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 move.