This is a hard question because there are multiple factors, but temperature is a known factor. And the recent temperature highs are generally considered to be related to the climate crisis. 2020's historic heat and fires caused a shift toward a stronger climate attribution, and 2021 seems to me to be sealing the deal. If there were record heat waves and less fire this year, then I think the evidence would have pushed things away from climate attribution, but that didn't happen. The scary part of this is that forest fires have not been part of the climate models because scientists hadn't reached a strong enough confidence, but they are becoming a positive feedback loop as they release more carbon each year. And the climate models were already dire without forest fires.