The fires, likely to be the costliest in world history, were made about 35% more likely due to the 1.3°C of global warming that has occurred since preindustrial times.

The California fires erupted amid extremely dry conditions. UCLA scientists say extreme heat linked to climate change was a factor in the fires' intensity.

In a new quick-turn analysis, UCLA climate scientists found that climate change could be responsible for roughly a quarter of the extreme vegetation dryness present when the Palisades and Eaton fires began. But they say the fires would still have been extreme even without that moisture deficit.