The subject of the cause of wildfires is being studied intensely by specialists, and by partisans, and by horrified and urgent public individuals, at this time.

The subject of the cause of wildfires is being studied intensely by specialists, and by partisans, and by horrified and urgent public individuals, at this time. California has the ability to collect data and study in ways that can be applied to other fire-prone landscapes where there are fewer resources. Current research shows that the large majority of wildfires in California are caused by humans at this time. A parent comment here ("stochastic") is basically accurate. (references on request) Dry lightening is also a leading cause of wildfire in the dry season, and was the cause of many, many simultaneous fires recently in California.