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Global mean sea levels have risen faster in the 20th century than in any prior century over the past 3,000 years.

Surging sea levels are creating “a rising tide of misery” that threaten the future of nearly a billion people that live in low-lying coastal areas, the UN chief has warned, as they become increasingly vulnerable to storm surges, coastal erosion and flooding.

Since the beginning of the 20th century, the global mean sea level has risen faster than in any prior century over at least the past 3,000 years.

NASA says that as global temperatures have risen about one degree Celsius (1.8F), sea levels have gone up 160 to 210 millimeters (six to eight inches) with about half of that amount occurring since 1993.

“Rising seas mean a rising tide of misery,” said Antonio Guterres, speaking at a summit that placed sea-level rise at the top of the international agenda at the UN General Assembly earlier this week.

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