Is this the end of forests as we've known them?

Trees lost to drought and wildfires are not returning. Climate change is taking a toll on the world's forests - and radically changing the environment before our eyes

Camille Stevens-Rumann never used to worry about seeing dead trees. As a wildland firefighter in the American west, she encountered untold numbers killed in blazes she helped to extinguish. She knew fires are integral to forests in this part of the world; they prune out smaller trees, giving room to the rest and even help the seeds of some species to germinate.

We have largely operated under the assumption that forests are going to come back after fires," Stevens-Rumann said.