‘Zombie’ forest fires may become more common with climate change

Wildfires that smolder underground in the winter can reemerge after warm summers

smoke billows up behind a row of trees

A forest fire burns in the distance in Canada’s Northwest Territories. New research suggests that zombie fires, which smolder underground through winter months, could increase as climate change accelerates in areas like Alaska and other parts of North America.

Sherry Galey/Moment Open/Getty Images Plus

Winter usually kills most forest fires.