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Nearly half of China's major cities are sinking, researchers state

Almost half of China's. major cities are suffering moderate to extreme levels of. subsidence, putting millions of individuals at danger of flooding. especially as sea levels rise, according to a study of. across the country satellite information launched on Friday.

The authors of the paper, published by the journal Science,. found 45% of China's city land was sinking faster than 3. millimetres per year, with 16% at more than 10 mm annually,. driven not just by declining water tables but likewise the sheer. weight of the built environment.

With China's metropolitan population already in excess of 900. million people, even a little part of decreasing land in China. could therefore translate into a considerable threat to city. life, said the group of researchers led by Ao Zurui of the South. China Typical University.

Subsidence already costs China more than 7.5 billion yuan. ($ 1.04 billion) in yearly losses, and within the next century,. almost a quarter of seaside land might really be lower than. sea levels, putting numerous millions of people at an even. greater threat of inundation.

It really brings home that this is for China a national. issue and not a problem in just one or two places, stated. Robert Nicholls at the Tyndall Centre for Climate Change. Research at the University of East Anglia. And it is a. microcosm of what is occurring around the rest of the world.

The northern city of Tianjin, home to more than 15 million. individuals, was identified as one of the worst-hit. In 2015, 3,000. homeowners were evacuated after a unexpected geological catastrophe. that investigators blamed on water exhaustion in addition to the. construction of geothermal wells.

A lot of China's old coal districts have also suffered as a. outcome of overmining, with authorities often required to inject. concrete into the falling apart shafts to enhance land.

The problem is not limited to China. A separate study. released in February said around 6.3 million square km (2.4. million square miles) of land around the world was at risk. Amongst the worst-hit nations is Indonesia, with big parts of. the capital Jakarta now listed below sea level.

Nicholls stated vulnerable cities might find out lessons from. Tokyo, which sank by about 5 m (16 feet) up until it prohibited. groundwater extraction in the 1970s.

Subsidence mitigation ought to be taken a look at extremely seriously,. however you can't stop all of it so you are talking about adaptation. and building dykes, he included.

Of the 44 major coastal cities experiencing the issue,. 30 were in Asia, according to a 2022 Singapore study.

It is an issue of urbanisation and population growth -. larger population density, more water extracted,

(source: Reuters)