Word: windbreaks
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Dates: during 1990-1999
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Another plant is overrunning parts of the Southwest, including the Grand Canyon. Introduced about 70 years ago to act as an erosion fighter and windbreak, the tamarisk tree has taken over about 81,000 hectares (200,000 acres), pushing out native trees and threatening eight species of birds that nest in them. The Grand Canyon's major animal offenders are burros; turned loose by prospectors generations ago, they have grown into vegetation- devouring herds...