Part 5/15:
For instance, a report from Environment and Climate Change Canada claimed that recent Canadian heatwaves were 2 to 10 times more likely because of human influence. Such a broad range indicates considerable uncertainty, with the lower bound possibly overstating the influence. Furthermore, these assessments depend on climate models simulating an imaginary "pre-industrial" climate—often rooted in guesswork rather than concrete data—making definitive claims questionable.