From Maine to Georgia, scientists use desperate measures to stop invasive insects from destroying vital hemlock forests. (Video: Assignment Earth)

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"Assignment Earth" features compelling video reports from the front lines of major environmental stories from around the globe. Topics include global warming, pollution, habitat destruction and endangered species.

Learn more:

Save our Hemlocks

USDA Forest Service

Assignment Earth: Dying hemlock
Video: An invasive insect threatens the species.