Climate change is affecting human movement now, causing internal displacement and international migration, and will do so in the future. But the impact is often indirect, and rarely is the process as straightforward as one might think. This article provides an overview of research on how climatic hazards drive and affect migration, reviewing which types of people might migrate and under what conditions.

In the United States, Republicans and Democrats are deeply divided on immigration. President Donald Trump and Democratic presidential nominee Joe Biden have offered sharply diverging policy positions, and the outcome of the election is sure to have profound consequences for the U.S. immigration system. Yet this partisan divide is relatively new. Just two decades ago, the parties were much more united on immigrants’ role in the U.S. economy and society.