China: Fish farms cause rapid sea-level rise

Nature: Groundwater extraction for fish farms can cause land to sink at rates of a quarter-metre a year, according to a study of China’s Yellow River delta1. The subsidence is causing local sea levels to rise nearly 100 times faster than the global average. Global sea levels are rising at about 3 millimetres a year owing to warming waters and melting ice. But some places are seeing a much faster rise -- mainly because of sinking land. Bangkok dropped by as much as 12 centimetres a year in the 1980s thanks......

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