The human ecological footprint is expanding so rapidly that it is difficult to monitor its impacts on aquatic systems.
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Q43: Forests cover less of the U.S. today
Q44: Reducing soil erosion, purifying air and water,
Q45: _ contributes to the greenhouse effect by
Q46: Tropical forests account for 25% of the
Q47: Mining, recreation, lumber, and fuel wood are
Q49: Forests that have grown in an area
Q50: Excluding Greenland and Antarctica, forests cover about
Q51: The removal of large tracts of forestland
Q52: More freshwater fish are threatened with extinction
Q53: Conversion of forests and woodlands to agricultural
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