The team used observations of past weather and computer simulations that compared what happened this month to a what-if world without the 1.3 degrees Celsius (2.3 degrees Celsius) of human-caused climate change.

Human-caused climate change made the Los Angeles-area fires more likely and more destructive, according to a study out Tuesday. Why it matters: The study — from an international group of 32 climate researchers — shows how climate change fits into the myriad factors that made the multiple blazes one of California's most destructive and expensive wildfire disasters on record.