Climate change is a new driver of human migration that many people expect will dwarf all others in its impact. While the effects of climate change on migration have generated significant attention, some of the most commonly repeated predictions of the numbers of people who will be displaced are not informed by an understanding of migration dynamics. Displacement is almost always a result of a complex mix of factors; people adapt to changes and governments (and a few other powerful actors) can influence what kind of movements take place in response to environmental changes.