Most earthworms in U.S. soils aren't native--and they are threatening America's forests. Smithsonian ecologist Melissa McCormick explains how earthworms can be good for gardens and bad for forests, and how they could alter the course of climate change. View more Ecosystems on the Edge videos and learn how you can help at http://ecosystems.serc.si.edu. Created by the Smithsonian Environmental Research Center.
10 min 16 sec
Animal health;Environmental Sciences;Coastal ecology Search this