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Rising sea level puts US Atlantic coast at risk: report

“Scientists predict that this will lead to increased beach erosion and more frequent coastal flooding.”

Another study has shown a 1-meter sea level rise to increase New York's severe flooding risk from one incident every century to one every three years.

The USGS report was based on actual tide level measurements, said Doran. Other studies have shown a similar hotspot using climate models.

In a 2007 assessment report, the United Nations' Intergovernmental Panel on Climate Change said global warming would cause the sea level to rise by up to 59 centimeters by century's end.

Even this relatively modest projection would render several island nations unlivable and wreak havoc in low-lying deltas home to hundreds of millions.

But reports since then have said that melting Arctic ice plays a greater role in sea level rise than previously suspected, and most climate change scientists now project the ocean will rise roughly a meter by century's end.

Climate warming causes sea levels to rise by melting land-ice and through the thermal expansion of water.

In a separate study in Nature Climate Change, European scientists said a 1.5-degree-Celsius rise in global temperatures would see sea levels peak at about 1.5 meters above 2000 levels.

But warming of two degrees would result in sea levels reaching 2.7 meters — nearly double.

The U.N. is targeting a 2 degrees Celsius (3.6 degrees Fahrenheit) limit on warming from pre-industrial levels for manageable climate change.

“Due to the long time it takes for the world's ice and water masses to react to global warming, our emissions today determine sea levels for centuries to come,” said lead author Michiel Schaeffer of Wageningen University in the Netherlands.

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