Forest fires, a.k.a. wild fires, happen on both sides of the border. Right now, it's smoke from Canadian fires drifting south, next month, it may be smoke from American fires drifting north. Those fires don't really have a lot to do with climate change, although the warmer climate is undoubtedly making fire season last a little longer with slightly more frequent fires. The geological record says fires have been common over much of North America at least since the last Ice Age.
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Forest fires, a.k.a. wild fires, happen on both sides of the border. Right now, it's smoke from Canadian fires drifting south, next month, it may be smoke from American fires drifting north. Those fires don't really have a lot to do with climate change, although the warmer climate is undoubtedly making fire season last a little longer with slightly more frequent fires. The geological record says fires have been common over much of North America at least since the last Ice Age.