In Nomad Century, science writer and broadcaster Gaia Vince – the first woman to win the Royal Society Science Book of the Year Prize – presents an urgent investigation of the most underreported, seismic consequence of climate change: how it will force us to change where – and how – we live. With every degree of temperature rise, a billion people will be displaced from the zone in which humans have lived for thousands of years. But the reality is that huge swathes of the world are becoming uninhabitable. Vince, in a rousing call to arms, describes how we can plan for and manage this unavoidable climate migration while we restore the planet to a fully habitable state. She talks to Tom Bullough, author of Sarn Helen.