The forest scientists collected wooden samples from old, burned pine trees and stumps and analyzed their tree rings in order to map forest fires from 1300 onwards. The oldest forest fires were from before the Black Death (1350). (Photo credits: Erik Holand, Ken Olaf Storaunet, NIBIO, and Jørund Rolstad, NIBIO. Painting: Eero Järnefelt, Ateneum museum in Helsinki, Finland.)
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