five times more likely<\/mark><\/a> because of climate change.<\/li>\n<\/ul>\n\n\n\n<\/p>\n\n\n\n
Floods and storms <\/strong><\/p>\n\n\n\n\n- Ocean warming caused by climate change adds warmth and moisture to the air, increasing the risks of storms and intensifying them<\/mark><\/a>. This warming not only fuels the formation of hurricanes, but leads to hurricanes producing more rainfall, moving further inland, and undergoing rapid intensification more often<\/mark><\/a>.\u00a0
<\/li>\n\n\n\n- This year\u2019s Hurricane Helene was one of the deadliest hurricanes to strike the U.S. mainland in the last 50 years<\/mark><\/a>. According to a rapid climate attribution study done by the Lawrence Berkeley National Laboratory, climate change caused Hurricane Helene to drop 50% more rainfall<\/mark><\/a> in certain parts of the U.S. and made those record rainfalls up to 20 times more likely<\/mark>.<\/a>
<\/li>\n\n\n\n- Just two weeks later, Hurricane Milton rapidly intensified over the Gulf of Mexico to a category 5 hurricane. Researchers from World Weather Attribution found climate change made Milton 20% to 30% more intense<\/mark><\/a>.
<\/li>\n\n\n\n- Previous studies have shown climate change makes high temperatures in the Gulf of Mexico between 400 and 800 times more likely<\/mark><\/a>.
<\/li>\n\n\n\n- Toronto\u2019s 2024 summer floods brought nearly 100 centimetres of rain in just three hours<\/mark><\/a>, flooding many homes and businesses. These floods are estimated<\/mark><\/a> to have cost around $1 billion in insurable claims. Across Canada, one-in-50-year rainstorms could happen every 10 years by late century under a high-emissions scenario, according to a 2019 federal assessment<\/mark><\/a>.
<\/li>\n\n\n\n- The remnants of Hurricane Debby brought record-breaking floods to Quebec in the summer of 2024, inundating 55 communities, leading to the most costly weather event in Quebec\u2019s history<\/mark><\/a>, with insured losses amounting to $2.5 billion.
<\/li>\n\n\n\n- Hurricane Fiona, which hit Atlantic Canada in 2022, was the most costly weather event<\/mark><\/a> ever to hit the region.
<\/li>\n\n\n\n- An atmospheric river weather system hit B.C.\u2019s south coast in October 2024, causing record-breaking torrential rain, setting off a mudslide, overwhelming infrastructure, and killing at least three people<\/mark><\/a>. Research suggests<\/mark><\/a> that atmospheric river weather systems are increasing in frequency, intensity, and damage because of climate change.
<\/li>\n\n\n\n- One-in-100-year flood events in Toronto and Montreal are expected to become one-in-15 year events by the end of the century as a consequence of climate change, according to a study<\/mark><\/a> by scientists from Western University and the National Research Council of Canada.
<\/li>\n\n\n\n- Another study found that extremely rainy days are 18% more likely<\/mark><\/a> now than they were in pre-industrial times as a result of climate change. This is expected to climb to 65% if global warming reaches 2\u00b0C.<\/li>\n<\/ul>\n