In great forest fires, an enormous number of trees burn, and such fires lead to great amounts of CO2 being released into the air. Despite this, forest fires are not thought to increase the greenhouse effect.
Fossil fuels, just like trees, are also natural substances. When fossil fuels such as coal and gas are burnt they also release CO2 into the air. Explain why burning fossil fuels affects our climate but burning forests doesn't.
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1. Forest fire on Bitterroot National Forest, Montana. Photo courtesy of John McCougan, Alaska Fire Service, 2000
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