Climate change is already influencing how and where people live. In North, Jesse M. Keenan argues that America is entering a new era marked by shifts in population that will transform everything from the physical landscape of cities to electoral politics. First, Keenan examines how human mobility is shaped by the environment and the economy. Next, he provides a conceptual and empirical overview of adaptation science, with a focus on how people, governments, and markets are preparing for and responding to climate impacts. He documents how physical impacts in the built environment, escalating costs, and public sector inertia are converging to drive people out of high-risk areas, while, at the same time, certain other areas are attracting people who seek a more sustainable way of life. North is not just a collection of scientific observations and projections about the peril of those left behind. It is also a projection of optimism about America's capacity for decarbonization, environmental stewardship, and economic mobility for those on the move.