Canada’s enormous wildfires and the acrid haze they’ve spread across North America have widened a schism in the country’s politics.

While politicians in Alberta and Saskatchewan — Canada’s oil-producing heartland — and Conservatives in Ottawa can no longer deny climate change, they continue to stand in the way of Prime Minister Justin Trudeau’s ambitions. That could leave one of the world’s biggest fossil fuel producers without a credible pathway to reduce carbon emissions at the same time that the impacts of climate change send its forests up in smoke.

The fires have burned through more than 13 million acres, an area twice the size of the U.S. state of Massachusetts, putting this year on track to be the worst on record. As the blazes force tens of thousands from their homes and cloud the air with toxic smoke, Canada’s opposition leader has called for an end to the country’s carbon tax. Trudeau’s chief rival, the populist Conservative Pierre Poilievre, spoke for hours in Parliament last week in an attempt to stall the ruling Liberal Party’s budget. During his speech, he reiterated one of his signature promises should the Tories regain power: "Technology, not taxes.”