When smog floated above America’s big cities, it caused acid rain. It is sulfuric or nitric acid that falls to the ground ...

Decades ago, acid rain was one of the world’s most alarming environmental crises. Pollution from coal power plants and cars made rainfall so toxic that it killed fish, wiped out forests ...

Acid rain is one of the most destructive environmental threats to forests and their inhabitants. From weakening trees to harming wildlife, this invisible danger is reshaping entire ecosystems.