Anyone who remembers the 70s and 80s will probably remember acid rain. Industrial emissions acidified precipitation around the globe, which killed forests and crops, rendered lakes inhospitable, corroded buildings, and exacerbated human health problems. But anyone who follows environmental news will be surprised to learn this: we solved it! Countries came together to limit acid rain-causing emissions, eliminating the problem altogether. …kind of. Acidic precipitation may not be a thing of the past after all.