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 that create problems.
All the tree cutting is happening in an unlikely spot: Sagehen Experimental Forest, which is run by UC Berkeley in the High Sierra near Truckee.
Sagehen is protected and designated for research with all kinds of gadgets and cameras recording decades of data about this very diverse eco-system. Even a rare wolverine was spotted here.
Now like a lot of the Sierra, the forest is sick with too many trees competing for too little water.