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1 ene 1970 año - Clean Air Act - acid emission regulations

Descripción:

U.S. Congress imposed acid emission regulations through the Clean Air Act, strengthened two decades later in 1990. By the 2000s, sulfate and nitrate in precipitation had decreased by some 40 percent.

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Health and Wellness

Bychyelle Jiazten milgrom
9 nov 2019
0
0
528

fecha:

1 ene 1970 año
Ahora mismo
~ 55 years ago
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