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100 Year Floods?

Do so-called 鈥�100 year floods鈥� only happen once a century? Ruth Alexander and Wesley Stephenson investigate.
Also, does the air in Beijing cause as much damage as smoking 40 cigarettes a day?
(Image: Flooding in Paris in 1910. Credit: Getty)

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9 minutes

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Mon 14 Dec 2015 14:50GMT
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