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| Fri, 8th May 2020 18:15:00 |
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Sea levels could rise more than a metre by 2100, experts say |
Sea-level rise is faster than previously believed and could exceed 1 metre by the end of the century unless global emissions are reduced, according to a survey of more than 100 specialists.
Based on new knowledge of climate sensitivity and polar ice melt, the experts say coastal cities should prepare for an impact that will hit sooner than predicted by the United Nations and could reach as high as 5 metres by 2300.
"A global sea-level rise by several metres would be detrimental for many coastal cities such as Miami, New York, Alexandria, Venice, Bangkok, just to name a few well-known examples. Some may have to be abandoned altogether as they cannot be defended," said co-author Stefan Rahmstorf, from the Potsdam Institute for Climate Impact Research in Germany.
In the worst-case scenario – with rising emissions and global heating of 4.5C above pre-industrial levels – the study estimates the surface of the world's oceans in 2100 will be between 0.6 and 1.3 metres higher than today, which would potentially engulf areas home to hundreds of millions of people.
By contrast, if humanity succeeds in cutting carbon dioxide and holding the increase in temperature to 2C, the rise would be a more manageable 0.5 metre.
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