Sea levels are rising faster than they have in 28 centuries - here's what could happen to New York City

Getty Images/Afton Almaraz

Some would say it has already arrived.

The OECD ranked New York City among the 10 cities most vulnerable to rising sea levels with 2.9 million people and $2.1 trillion in assets exposed to storm surges by 2070 if sea levels keep rising.

And an ominous new study shows sea levels across the globe are rising faster than they have in 28 centuries.

This builds on previous reports, including one published last year that focused on New York City. That report suggested that by as early as the end of this decade, NYC will already be a warmer, stormier, less-pleasant place.

Hurricane Sandy, just one of the symptoms of a warming planet, was our first dire warning.