“With acid rain,” he said, “what comes down is much worse than what went up — worse in its potential damage to trees and crops, worse in its potential damage to fresh‐water lakes and ...

Looy picked up a spruce cone. Pollen from the trees around us might be preserved inside. She believes that the Permian extinction was caused by acid rain following a massive release of volcanic gases.

Nitrogen oxides are produced by burning fossil fuels and contribute to ozone formation, acid rain, nutrient pollution and poor visibility. Acid rain harms plants and wildlife by altering the pH levels ...