ProPublica and The New York Times Magazine, with support from the Pulitzer Center, have for the first time modeled how climate refugees might move across international borders. This is what we found.

Scientists have learned to project such changes around the world with surprising precision, but — until recently — little has been known about the human consequences of those changes. As their land fails them, hundreds of millions of people from Central America to Sudan to the Mekong Delta will be forced to choose between flight or death. The result will almost certainly be the greatest wave of global migration the world has seen.
https://features.propublica.org/climate-migration/model-how-climate-refugees-move-across-continents/