Permafrost contains microbes, mammoths, and twice as much carbon as Earth’s atmosphere. What happens when it starts to melt?

Video | In northern Siberia, the warming climate is leaving people feeling like the ground is "going out from under their feet."

Reindeer herders in Russia's Arctic have discovered what scientists say is the first-ever cave bear carcass with soft tissues intact in the region's rapidly thawing permafrost.