Has anybody heard the media try to spin the magnitude of these fires as a result of global warming? What a crock of manure! The impact and destruction of these fires would be the same regardless of the warming or cooling of the climate. Wildfires create their own climate (winds, temperature, and even rains), which lead to massive destruction that can be seen year after year with these large wildfires.
As far as determining how the fires started, there are four categories: Natural, Accidental, Unknown, and Incendiary (intentionally set -- arson). Note that "suspicious" is not a category. If you read a news article or hear on the news that a fire is determined "suspicious", question that investigator's credibility. There are no suspicious fires, only suspicious fire investigators!