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As of 2000, Ecuador's major environmental problems were erosion in the highland areas; deforestation, especially in the Oriente; and water pollution. The Ecuadoran Institute of Water Resources estimated that the amount of arid land increased by 31.5% between 1954 and 1979, when 7.5% of the coastal lowland and Sierra were classified as arid. Between 1981 and 1985, 340,000 hectares (840,000 acres) of land were deforested annually. By the 1990s, Ecuador had lost over 30% of the original mangrove area, which
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