May 29 (UPI) -- Zombie fires -- blazes that have smoldered underground in the Arctic after last year's fire season -- have erupted above the surface in Alaska, Canada, Greenland and Russia, threatening the burn thousands of acres this season, scientists said.
An unusually warm and dry season in the Arctic last summer helped spark wildfires from Alaska to Siberia. Some 3,000 wildfires were reported in Canada along in 2019.