Greenland is losing ice seven times faster than it was in the 1990s.
The assessment comes from an international team of polar scientists who’ve reviewed all the satellite observations over a 26-year period.
They say Greenland’s contribution to sea-level rise is currently tracking what had been regarded as a pessimistic projection of the future.
It means an additional 7cm of ocean rise could now be expected by the end of the century from Greenland alone.
This threatens to put many millions more people in low-lying coastal regions at risk of flooding.
It’s estimated roughly a billion live today less than 10m above current high-tide lines, including 250 million below 1m.
“Storms, if they happen against a baseline of higher seas – they will break flood defences,” said Prof Andy Shepherd, of Leeds University.
“The simple formula is that around the planet, six million people are brought into a flooding situation for every centimetre of sea-level rise. So, when you hear about a centimetre rise, it does have impacts,” he told BBC News.
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The British scientist is the co-lead investigator for Imbie – the Ice Sheet Mass Balance Inter-comparison Exercise.