Following a 50% tariff imposed by Washington on $28 billion in Canadian goods, Canada rejected a U.S. trade ultimatum, with Mark Carney announcing equal retaliatory duties and threatening energy export cuts to the United States.
Donald Trump Truth Social post and Canadian tariffs
The trade confrontation escalated rapidly after United States President Donald Trump posted on Truth Social that Washington and Canada had reached a trade agreement. That claim quickly unraveled. Canadian officials refused to yield to the pressure, prompting the White House to enact a 50% tariff on dozens of Canadian products valued at 28 billion Canadian dollars, which equals 16,3 milliards de francs. The sweeping levy targets roughly 5% of all Canadian merchandise exports heading south.
Mark Carney retaliatory duties and energy supply threat
Mark Carney replied: Canada will impose (as of September 8) equivalent tariffs, down to the exact dollar. The retaliatory duties are designed to strike American household appliances and electronic products, among other items. The chef du gouvernement canadien also threatened to cut off the energy supply, stating: We supply them with 99% of their natural gas, 85% of their electricity imports, and 60% of their crude oil imports.
The diplomatic collision runs parallel to an intensifying cross-border dispute over environmental policy and natural disasters. United States President Donald Trump has accused Canada of wilful negligence
over wildfires, blaming its forest management, threatening tariffs and floating demands for compensation. Smoke does not carry a passport, and wildfires are burning across several countries, causing evacuations and devastating communities. In North America, smoke from fires has spread over many parts of central Canada and the U.S., while wildfires are currently scorching vast areas in Oregon and the Pacific Northwest. In Europe, France and Spain have evacuated hundreds of thousands of residents as wildfires close in on Bordeaux, France, and grow around Madrid, Spain.
Canada record 2023 season and study on human influence
Despite Trump’s claims, Canada cannot log, rake or prescribe-burn its way out of a planetary problem. Wildfires require ignition, combustible fuel and weather that permits rapid spread, with lightning responsible for most of the area burned in Canada. Warming weather increasingly determines whether a spark dies or becomes a catastrophe through hotter air, earlier snowmelt and longer summers that mean a drier landscape and more severe fire seasons. A 2024 study found that human influence has made fire seasons like Canada’s record 2023 season more than five times as likely across nearly every Canadian ecozone. While forest management practices, fire suppression, accumulated fuels, vulnerable development and inadequate community protection raise risk in some regions, many of Canada’s largest fires burn in remote boreal landscapes, and much of the boreal forest is not manageable.
Paris climate agreement and U.S. National Oceanic and Atmospheric Administration El Niño
Trump’s demand that Canada pay for wildfire smoke is especially galling because the U.S. has emitted more cumulative fossil carbon dioxide than any other country. Furthermore, Trump withdrew the U.S. from the Paris climate agreement while promoting fossil-fuel expansion — worsening the conditions that drive wildfire risk — and now blames a neighbour for the smoke. Better emergency response, FireSmart communities, resilient infrastructure, prescribed and cultural burning and science-based forest management can reduce losses, but these measures only buy time and do not address the root of the problem. Cultural burning is sophisticated, locally valuable and was often suppressed by colonial governments, but no knowledge system provides a complete operating manual for the speed and scale of climate warming we are facing, as cultural and prescribed burning cannot re-freeze permafrost, cool the atmosphere or restore lost snowpack.
The strengthening El Niño adds risk as a natural, temporary rearrangement of heat between the tropical Pacific and the atmosphere unfolding atop a long-term human-caused warming trend. The U.S. National Oceanic and Atmospheric Administration gives El Niño an 81 per cent chance of becoming very strong from October through December and a 97 per cent chance of persisting into early spring 2027. El Niño will tilt the odds toward drought in some regions, heavy rainfall or flooding in others and additional heat and marine heatwaves. In Canada, a mild winter or thinner snowpack could mean earlier spring drying and greater fire risk next year, while typically raising fire danger in Australia.
