"The most climate-stressed regions all contained permafrost, which is vulnerable to thaw as temperatures rise," researcher Sue Natali said.

Normally confined to regions closer to the poles, such as Alaska and Canada ... As shown on the map, some of the best chances ...

Mount Churchill stands in a white corner of the Alaska map, deceptive in its cold, windblown silence. At least twice in the last few thousand years, the peak’s ice-covered caldera has spewed ash that ...

A coronal mass ejection earlier this week may pull the northern lights to more northern U.S. states, forecasters said.