Maria Benech of the U.S. Forest Service surveys a severely burned patch of forest. Almost 40 percent of the burned area looks similar. Lauren Sommer/KQED hide caption

itoggle caption Lauren Sommer/KQED

A charred tree rests on the forest floor after being sawn down to a stump Friday. Firefighters are still working to contain the Rim Fire, which is now the third-largest wildfire in California's history. Mike McMillan/U.S. Forest Service hide caption

itoggle caption Mike McMillan/U.S. Forest Service

A charred caution sign just outside of California's Yosemite National Park. David McNew /Reuters/Landov hide caption

itoggle caption David McNew /Reuters/Landov