The natural environment gives us a wealth of services that are difficult to measure in dollars. Natural areas help clean our air, purify our water, produce food and medicines, reduce chemical and noise...
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Environment - current issues: air pollution in large cities; water pollution from the discharge of sewage and industrial effluents; acid rain; drift net fishing. Forests were cleared over many centuries...
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Places to use dirt road mats: IN THE PARK, RESORT, FARM...
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