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President Trump’s claim that Canada is “poisoning” American air with wildfire smoke is facing strong pushback from climate scientists, who say he is blaming a country for a crisis it did not create. Trump raised the issue with Canadian Prime Minister Mark Carney and later told reporters at Joint Base Andrews that the fires need to stop. The exchange happened during the World Cup final. Trump confronted Carney at the match, telling him directly that American air was being poisoned and that the fires had to be brought under control. Afterward, he floated financial consequences. He suggested Canada should either pay damages or face new tariffs over the smoke. Trump has framed the fires in unusually aggressive terms. On Truth Social, he wrote that the United States was being “unnecessarily invaded” by polluted air from Canada’s poorly maintained forests, calling it willful negligence that costs America billions every year. Some allies in Congress have echoed that tone, with talk of legislation targeting Canada’s forestry practices. Meanwhile, the smoke itself has been widespread. Fires that began in mid-June spread further in July, affecting roughly 100 million Americans across 14 states. Canadian officials note that this year’s boreal forest losses are running well above the historical average. Scientists reject the idea that Canada is at fault. Climate researcher Michael Mann has compared Trump’s stance to someone causing a car crash through reckless driving, then sending the other driver the repair bill. He went on arguing that the administration’s own fossil fuel expansion is worsening the very problem it’s blaming on Canada. Stanford’s Marshall Burke points out that most of the burning Canadian forest is remote and largely unmanaged, unlike forests in the US. That rising global temperatures, not any lack of Canadian action, are driving the surge in extreme fire conditions. Wildfire ecologist Lori Daniels of the University of British Columbia called the attacks on Canada uninformed, saying they ignore both the human toll and the firefighters risking their lives on the front lines. She noted that targeted forest thinning, inspired by Indigenous land practices, could help in some North American forests, but wouldn’t make much difference across Canada’s vast, sparse boreal landscape. Carney has pushed back too, telling reporters that fighting climate change is “the responsibility of all countries, including the United States”, noting that some U.S. energy policies work against clean energy goals even as Canada pursues its own climate efforts globally.