They are mainly Federal lands and so it is mainly Federal policy and practice that would be to blame in the US for that aspect of the causes. But the most obvious international common denominator is hotter, drier, windier weather - although I would not be surprised if many countries have similar "modern" responses to forest fires.

Forest management is bad overall, who will pay for it? In US/Canada the heat dome made for extreme weather. In Europe, record heat and rainfall causing extreme floods. We're having both, bad mitigation and climate catastrophe, going on. Plus Covid, pretty much following Hopi prophecies.

How does the fires being common across the region absolve California of the accusation of mismanagement? Isn't that more damning?

Calling "the entire northern hemisphere" a "region" is a bit of a stretch; GP is presumably referring to the summer season (which is not shared by the southern hemisphere at this time), not proximity to California.

There are two problems that required to Solutions. Many of the areas that are burning now had a burn interval I'm less than 5 years prior to Federal wildfire suppression. They haven't burned in the last 150 years because of this. This is a real problem that needs to be addressed on top of climate change.