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Days of rain have caused widespread damage and led to 200,000 evacuations in central China. Why was the city of Zhengzhou overwhelmed? And will China now do more to tackle man-made climate change? Wang Huiyao, a Chinese environmental adviser spoke to Newshour's Tim Franks about how the central China floods represent a huge challenge for China. [People walk in the flooded road after record downpours in Zhengzhou city in central China's Henan province. Credit: European Pressphoto Agency]