Point to ponder. States forests generally in higher average temperature climate zones so presumably grow more each year. More natural "droppings" to compost. Presume part of climate zone is precipitation? Maybe? So maybe it's droppings rate vs moisture driven composting rate = if "dry", fuel buildup. Don't know how the race balance has been affected in the north/Canada. Need a botanist to explain the workings of that balance. In the face of rising average temperatures and more extreme weather (weather system energy). Is it as simple as more heat = more dry? Definitely a puzzle. Maybe more % lightning strikes per storm? IIRC more intense storms = lightning.