A polar vortex dipping down from Siberia is bringing a cold front with frigid temperatures to millions Americans. See maps of ...

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

New research reveals the Arctic is changing fast as permafrost regions are warming, forests are stressed, and flooding is ...

According to the new map, the magnetic North Pole has shifted from northern Canada toward Siberia over the past five years. It also indicates that the locations of blackout areas, where compasses ...