From Slate:Why do we never hear about acid rain anymore? Did it just go away?
Back in the 1980s, when the Lantern herself was just a little penlight, acid rain was the environmental scourge of the day. Canada's environmental minister proclaimed it an "insidious malaria of the biosphere"; it menaced the Transformers; it turned Kimberly's hair bright green in an episode of Diff'rent Strokes. Toxic precipitation fell off the radar in 1990, when Congress passed an amendment to the Clean Air Act calling for major reductions in the types of emissions that lead to acid rain. Emissions have dropped significantly since then, but the problem is far from gone.
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