A massive boulder on a coastal ridge in North Eleuthera, the Bahamas. A new research paper claims it was likely moved there by powerful storms during the last warm period of Earth history, 120,000 years ago, and warns that such stormy conditions could recur because of human emissions of greenhouse gases. Credit Charles Ommanney/The Washington Post, via Getty Images

A massive boulder on a coastal ridge in North Eleuthera, the Bahamas. A new research paper claims it was likely moved there by powerful storms during the last warm period of Earth history, 120,000 years ago, and warns that such stormy conditions could recur because of human emissions of greenhouse gases. Credit Charles Ommanney/The Washington Post, via Getty Images

A massive boulder on a coastal ridge in North Eleuthera, the Bahamas. A new research paper claims it was likely moved there by powerful storms during the last warm period of Earth history, 120,000 years ago, and warns that such stormy conditions could recur because of human emissions of greenhouse gases. Credit Charles Ommanney/The Washington Post, via Getty Images