

The World Bank predicts climate change may displace 143 million people by 2050. Environmental shifts have caused migration on smaller scales throughout the history of North America, historians say.
(Image credit: Dorothea Lange/AP)
The World Bank predicts climate change may displace 143 million people by 2050. Environmental shifts have caused migration on smaller scales throughout the history of North America, historians say.
(Image credit: Dorothea Lange/AP)