Extreme weather is contributing to undocumented migration and return between Mexico and the United States, suggesting that more migrants could risk their lives crossing the border as climate change fuels droughts,

Extreme weather in Mexico is contributing to undocumented migration and return between Mexico and the United States

Extreme weather is a factor in driving both illegal border crossings from Mexico into the U.S. and whether migrants return to Mexico, according to new research published in the Proceedings of the National Academy of Sciences (PNAS).