Here is the boreal forest map
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And here is the latest fire map
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You can see that almost all fires are in the boreal forest. Why are some areas hit harder than others? Weather patterns mostly. In Ontario, the MNR claims that 50 percent of forest fires are due to lightening, and the other 50 due to human causes. I think that is an inaccurate assessment, my belief is that most forest fires are weather generated. In many of the areas that burn, there is no human activity. The racist bumpkin headed nincompoops in the local area will claim that the local Indigenous are setting the fires, so they can get evacuated, etc, but that is just the ravings of unhappy one toothed cousin kissers.
In dry years, we have lots of fires. In wet years we have very few. In my immediate vicinity, there are very few fires burning. We have had a steady diet of large rainfalls all summer. Rivers are uncharacteristically high for the season. Bugs are bad.
In Nova Scotia, the government has just declared any activity in the bush to be forbidden. $25,000 fine for those caught, even if they are just hiking. It is very dry and hot out there right now.
In summary - climate is the biggest indicator of forest fire frequency, despite causes. Dry summers will see lots of fires, wet summers not many. According to general climate surveys, our climate is generally getting dryer and hotter, hence more fires. Of course, locally there will be trends that don't match the overall, and people will latch on to that to justify their belief that nothing ever changes in life, and that the only way to live is like it's the 1950's.