Sea level rises of eight inches have already worsened flooding effects from storms such as Hurricane Sandy.
Credit: John G Wilbanks/Alamy

Even if world manages to limit global warming to 2C — the target number for current climate negotiations — sea levels may still rise at least 6 meters (20 ft) above their current heights, radically reshaping the world’s coastline and affecting millions in the process. (emphasis added)

That finding comes from a new paper published on Thursday in Science that shows how high sea levels rose the last time carbon dioxide levels were this high.

That was about 3m years ago, when the globe was about 3-5F warmer on average, the Arctic 14.4F warmer, megasharks swam the oceans, and sea levels stood at least 20 ft above their current heights.

The megasharks aren’t coming back but those sea levels could […]