Hemlock woolly adelgid is closing in on a private Adirondack forest where researchers are racing to protect the trees.

Add Yahoo as a preferred source to see more of our stories on Google. In the forest around Hart Prairie, about 14 miles north of Flagstaff, trees appear to be uprooting themselves and walking across ...

TRUCKEE, California (KGO) -- California forests are under extreme threat right now with more than 60 million trees killed by insects and drought in the past five years. And it's not just dead trees ...