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.
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.