Anthropologists believe early humans evolved in Africa and then moved out from there in successive waves. However, what drove their migrations has been a matter of conjecture.
One new explanation is climate change.
Anthropologist Anders Erikkson of Cambridge University in England says the first few hardy humans who left Africa might've gone earlier but couldn't. Northeastern Africa — the only route to Asia and beyond — was literally a no man's land.
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Here's some troubling news. Ice covering the Arctic Ocean has melted more dramatically this year than ever before. This year's loss of ice has exceeded the previous record by an area the size of Texas. NPR's Richard Harris reports.