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A fire in Greenland on July 10. Zombie fires smolder underground for months, notably in dense peatlands, and then flare-up when it grows warmer and drier. NASA

By Mark Kaufman

Some fires won't die.

They survive underground during the winter and then reemerge the following spring, as documented in places like Alaska. They're called "overwintering," "holdover," or "zombie" fires, and they may have now awoken in the Arctic Circle — a fast-warming region that experienced unprecedented fires in 2019. The European Union's Copernicus Atmosphere Monitoring Service is now watching these fires, via satellite.

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