Up until ~10 years ago, most boreal forest lightening strikes and human ignitions fell on damp ground, often damp from recent snow melt. Climate change has transformed this, turning the northern half of North America into a giant tinder box, where even the soil carbon can burn.
For those wondering why it's so hard to control remote wildfires in Canada, here are two maps which might help illustrate the problem. Let's call them: A) Where the people are; and B) Where the trees are.