In the 1970s, red spruce was the forest equivalent of a canary in the coal mine, signaling that acid rain was damaging forests and that some species – especially red spruce – were particularly sensitive to this human induced damage. In the course of studying the lingering effects of acid rain, scientists came up with a surprising result – decades later, the canary is feeling much better.
Scientists:
Produced by the USDA's Forest Service Northern Research Station.
Want more information? More at https://www.nrs.fs.fed.us/podcast/special/1
