Sinking river deltas put millions at risk of flooding

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Some of the world’s biggest megacities are located in river deltas threatened by subsidence due to excessive groundwater extraction and urban expansion, compounding the threat they face from sea-level rise The world’s most economically and environmentally important river deltas are sinking, putting millions of people at risk of flooding. In most cases, the sinking of river deltas poses a greater threat to the communities that live on them than sea level rise, according to an analysis of satellite data. Up to half a billion humans live on river deltas, including some of the poorest populations on Earth. Ten megacities with a population over 10 million people are located within these vast low-lying areas. Manoochehr Shirzaei at Virginia Tech and his colleagues attempted to determine the rate at which 40 river deltas around the world are sinking, including the Mekong, M
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