From Scientific American: Temperate Zone Forest Fires Can Cool the Climate
Climate models suggest that forest fires drive global warming by releasing greenhouse gases. The resulting climate change then lengthens the forest fire season and increases the number of fires each year, thereby pumping more greenhouse gas into the atmosphere and further exacerbating atmospheric warming. But a new study says that despite emitting heat-trapping methane and carbon dioxide into the atmosphere, fires in temperate zone (or boreal) forests may actually cool the climate significantly, because they leave behind a landscape that reflects sunlight.
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