evidence: Canada’s 2023 wildfires made international headlines, causing billions of dollars in property damage, displacing thousands of people from their homes, and spewing air pollution that traveled as far as Europe and China. A new analysis shows that the wildfires also had a massive effect on greenhouse gas emissions. [...] The 2023 wildfires in Canada accounted for more than a quarter of all tree cover loss globally that year and were largely driven by unusually hot temperatures and low precipitation. Québec, Northwest Territories, Alberta and British Columbia all experienced record high tree cover loss due to fires in 2023. [...] The reality is that the lines between "natural" and "anthropogenic" wildfires are blurring. Research shows that roughly half of all fires in Canada are directly started by people and, on average, they account for about 20% of the area burned each year. Furthermore, human-driven climate change is making fire seasons longer, resulting in larger and more frequent wildfires. By excluding all emissions and removals in managed forests affected by natural disturbances, Canada’s national GHG inventory may be underestimating land-based carbon emissions.