AI Summary

The US-Canada relationship is facing a new strain as a result of wildfires in Canada that have sent air pollution into US cities. The situation has prompted a threat from former US President Donald Trump, who claims that the US should impose new tariffs on Canada due to the air quality issues. This development comes as Canadian leader Mark Carney emphasizes the shared responsibility of both countries in addressing climate change, which experts believe is exacerbating the wildfire conditions.

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