Girl Planting seeds

Pollution controls help red spruce rebound from acid rain

The gray trunks of red spruce trees killed by acid rain once heavily scarred the mountain forests of the Northeast. Now those forests are mostly green, with the crowns of red spruce peeking out of the canopy and saplings thriving below.  A main reason, scientists say, is a government-enforced reduction in the kind of air pollution that triggers acid rain.  Read more...

 

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