For years, many people have assumed that climate change will send massive waves of “climate refugees” across borders around the world. But Jan Freihardt, a political scientist at ETH Zurich, says the reality is far more complicated. Studying communities along the Jamuna River in Bangladesh—where floods and erosion regularly destroy homes and farmland—Freihardt has followed families trying to decide whether to stay, move a little, or start over somewhere else. Distant migration is the option of last resort — and often not an option at all.