Extreme conditions helped drive the fast-moving fires that destroyed thousands of homes in the Pacific Palisades and Altadena.

Climate change caused by human activity increases the risk of devastating fires, like the ones in Los Angeles, California,according to the World Weather Attribution (WWA) network. The fires left at least 29 dead and thousands homeless.

Although pieces of the analysis include degrees of uncertainty, researchers said trends show climate change increased the likelihood of the fires.