A new study says human-caused climate change juiced the rainfall that triggered Pakistan’s floods by up to 50%.
August rainfall in the Sindh and Balochistan provinces -- together nearly the size of Spain -- was eight and nearly seven times normal amounts, while the country as a whole had three-and-a-half times its normal rainfall, according to the report by World Weather Attribution, a collection of mostly volunteer scientists from around the world who do real-time studies of extreme weather to look for the fingerprints of climate change.
The scientists not only examined records of past rains, which only go back to 1961, but they used computer simulations to compare what happened last month to what would have happened in a world without heat-trapping gases from the burning of coal, oil and natural gas — and that difference is what they could attribute to climate change. This is a scientifically valid technique, according to the U.S. National Academy of Sciences.
Study co-author Fahad Saeed, a climate scientist at Climate Analytics and the Center for Climate Change and Sustainable Development in Islamabad, Pakistan, said numerous factors made this monsoon season much wetter than normal, including a La Nina, the natural cooling of part of the Pacific that alters weather worldwide.
And climate change seemed to slightly change the jet stream, storm tracks and where low pressure sits, bringing more rainfall for southern provinces than they usually get, Saeed said.
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