Did you read the link at the bottom of the article? "Human activity responsible for 96% of wildfires around mediterranean basin" https://www.euronews.com/2019/

Did you read the link at the bottom of the article? "Human activity responsible for 96% of wildfires around mediterranean basin" https://www.euronews.com/2019/07/05/human-activity-responsible-for-96-of-wildfires-around-mediterranean-basin-wwf https://www.euronews.com/2019/07/05/human-activity-responsib... I don't know how well we could generalize this - but IIRC that's likely the case with this summer's fires in Siberia too; couldn't find much about wildfire causes in the US though.