In the 1970s, acid rain was one of the most serious environmental threats in North America and Europe. The air was so laden with pollution from coal power plants and cars at the time that it turned ...
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Climate change is a pollution problem, and countries have stopped similar threats before—think DDT and acid rainAcid rain damage across Europe and North America in the 20th century also showed the world how air pollution, which doesn't stop at borders, can become an international crisis requiring ...
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