Alberta is the largest greenhouse gas emitter of any province.
Claimed by: Cited across Alberta energy and climate debates
True: True as written according to the settled evidence. How we rate.
Summary
This is accurate. Alberta emits more greenhouse gas than any other province, largely because of its oil and gas sector. The 2025 national inventory put Alberta's 2023 emissions at about 263 megatonnes, roughly 38 percent of Canada's total, well ahead of Ontario in second place. On a per-person basis Alberta is second to Saskatchewan, but in absolute terms it is the clear leader.
Evidence
Environment and Climate Change Canada reports Alberta represented 38 percent of national emissions in 2023, the highest of any province.
Environment and Climate Change Canada (greenhouse gas executive summary 2025)
Alberta's emissions totalled about 263 megatonnes in 2023, with oil and gas the largest source, keeping it by far the largest provincial emitter.