When floods swept through parts of China’s Henan province last month, killing at least 302 people, a group of scientists who specialise in analysing the drivers of extreme weather events found themselves unable to help.
Like everyone else, they were horrified by the images of people trapped in water-filled subway stations, as whole blocks of the city of Zhengzhou were flooded by record rainfall.
Their work involves two core questions: did climate change make this disaster more likely? And did it make it worse?
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