Comment by _bin_

This isn't actually a very good attribution to specifically anthropogenic global warming. But it is a decent one to anthropogenic factors broadly. The metaphor of laying a fire is quite literal here: if global warming increases the number of sparks, that's actually the smaller piece of the problem. The bigger one is mismanagement of forest and ecological disruption leading to more and bigger fires laid for those sparks to catch.

My guess is there could be future impacts around the condition of forests that leads to susceptibility. Drought comes to mind as a serious risk. But a forest of dry trees is still a much harder environment for wildfires to form and spread than a forest of dry trees and no proper forestry to manage it.