In nature, fire is both beneficial and destructive, and can change a landscape for better or worse. Although fire kills many plants and animals, it also removes leaf litter and keeps brush from forming dense thickets. Many animals and plants have lived with fire for thousands of years and have adapted to survive. However, other fires contribute to erosion and wash nutrients from the soil. Most of the landscape in America has burned one or more times during the past few hundred years. Today, carefully controlled burns are helping to restore natural communities such as prairies and glades.
http://www.mdc.mo.gov/conmag/1997/06/40.htm
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