Donald Trump says Canada's woodland failure left US "invaded by filthy, polluted, and unhealthy air"

After President Donald Trump asserted in July that Canada’s alleged failure to maintain its woodlands had sent unhealthy smoke into the United States and suggested that the cost of that smoke be reflected in tariffs, wildfire experts pushed back. They said large Canadian fires mostly occur in remote northern forest where massive thinning or controlled burning is impractical, and that such blazes are a natural ecosystem process intensified by climate change. The experts also noted smoke does not stop at borders, and the U.S. has faced similar issues. They said the real long-term remedy is cutting emissions and adapting to smoke-filled summers.