Siberia's permafrost is melting with lasting consequences.

ON THE KOLYMA RIVER RUSSIA - JULY 6 Permafrost, seen at the top of the cliff, melts into the Kolyma River, Siberia, Russia on July 6, 2019. The permafrost, some of which is tens of thousands of years old, is melting at a rapid rate and uncovering prehistoric bones and animals. The melting is also damaging pasture and orchard land, turning once productive land into swamp. The Kolyma is one of the principal rivers of Siberia and in summer, an essential transportation artery. Melting permafrost is altering Siberia's landscape and economy. (Photo by Michael Robinson Chavez/The Washington Post via Getty Images)