Persistent drought kills millions of California trees

Wildfires spreading across this state are bigger and stronger than normal thanks to five years of drought. The temperatures are higher. The area is drier, and many trees are dead. Biologists say this drought has killed millions of trees. NPR's Christopher Joyce is here in California with a team of tree-climbing scientists who are assessing the damage. I talked to him earlier today.

Listen to the segment or read the transcript on NPR.