While US President Trump threatens tariffs over wildfire smoke drifting south, Canadian fire experts say large forest fires are inevitable. Over the past week, Trump has criticized Canadian fire management and said the country is “poisoning” U.S. air. …But experts say Canada’s worsening fire seasons reflect a harder reality: not every blaze, or the smoke that comes from it, can be stopped. “Saying that you would need to extinguish very huge fires like this is similar to trying to stop a hurricane,” said Martin Girardin, a forest ecology researcher with NRCan. …As of Monday, more than 900 fires were burning across Canada and more than 3.7 million hectares had burned in 2026, according to the Canadian Wildland Fire Information System dashboard. Girardin said climate change is helping drive worse fire seasons by bringing warmer temperatures and drier conditions, while many forests also have a buildup of fuel, including mature trees and other biomass.