Due to the impassioned persuasion & propaganda of environmentalists, California has not cleared out deadwood, underbrush, and other wildfire-fuel for 40 years.
While many officials & media outlets choose to blame "climate change," the study of wildfires shows that clearing out dead vegetation is the best prevention of massive wildfires and benefits forests in other ways.
In other words, these overwhelming & fast-traveling wildfires are caused by surplus of dead vegetation.
Also, historical records & tree rings indicate that southern California endures years-long droughts every so often.
And contrary to the attitude of nature-zealots, nature NEEDS human use to survive & thrive.
Not human greed, but healthy use.
That's how Hashem set up the world.
The Kli Yakar gleaned this from the Torah 400 years ago.
For more about the Kli Yakar's view of people & nature, plus some vivid photos & fascinating studies on wildfires, please see here:
The Torah View of Our Planet Earth: Use It or Lose It