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Over 1,700 American urban areas, including New York and Miami, are at risk from rising sea levels - authors of a new Proceedings of the National Academy of Sciences study quoted by The Guardian warn.

"Even if we could just stop global emissions tomorrow on a dime, Fort Lauderdale, Miami Gardens, Hoboken, New Jersey will be under sea level," said Benjamin Strauss, a researcher at Climate Central, and author of the paper. Dramatic cuts in emissions – much greater than Barack Obama and other world leaders have so far agreed – could save nearly 1,000 of those towns, by averting the sea-level rise, the study found.