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

With bipartisan leadership and cooperation between the U.S. and Canada, acid levels slowly reduced, and recent samples ...

Benji previously worked as a wildlife researcher. 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 ...