Siberia's permafrost is melting with lasting consequences.
ZYRYANKA RUSSIA - JULY 4 Permafrost, seen at the top of the cliff, melts into the Kolyma River outside of Zyryanka, Russia on July 4, 2019. The river 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)