Fires aren’t all bad. Some fires help forests become healthier, but scientists say they’re sorely lacking in California.
Sierra Nevada forests are adapted to low-intensity fires that clear the underbrush and prevent trees from getting too dense. After a century of fire suppression, many forests are overgrown, which can make catastrophic fires worse.
So forest managers are piloting a new policy designed to shift a century-old mentality about fire in the West.
The idea is to let naturally-caused fires burn when they aren’t a threat to homes or people. But actually making those decisions on the ground isn’t easy in a crowded state like California.