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Published: Sunday 08 September, 2013

cheap longchamp bags cheap longchamp bags Global Warming Is Rapidly Raising Sea Levels

About 130,000 years ago, global sea levels were 13 to 20 feet 4 to 6 meters higher than they are today. Scientists have determined this by studying ancient coral reefs that now sit high and dry, and other socalled paleoclimate clues.

The University of Arizonas Overpeck and his colleagues wanted to understand what sort of climate conditions were necessary to create such high sea levels.

When Overpecks team plugged those orbital conditions into a computer model, they found the Arctic warmed 5 to 8 3 to 5 sufficient to melt enough Arctic ice to explain the sea level rise.

But the researchers also know how much the Greenland ice sheet, which holds most of the Arctic water, melted at the time. When they plug that data into the model, the melt only accounts for 7.2 to 11.2 feet 2.2 to 3.4 meters of the water rise.

That means we got a substantial amount of water from Antarctica, Overpeck said. And that is a big discovery.

The finding suggests that, even though the cheap longchamp bags Antarctic itself did not warm, the ocean warming and sea level rise in the Arctic were sufficient to drive melting in Antarctica.

When the team used the same climate model to predict what will happen over the next 140 years from increasing greenhouse gases, they found that by 2100 the Arctic will be at least as warm as it w cheap longchamp bags as 130,000 years ago.

But unlike 130,000 years ago, todays atmospheric warming is global.

So it will be even more conducive to melting parts of the Antarctic ice sheet in the future than it was 130,000 years ago, Overpeck said.

And indeed that jibes nicely with a lot of observations coming in that suggest parts of the Antarctic ice sheet are alr cheap longchamp bags eady melting.

But if we continue to pollute at the current pace, he says, by the end of the century the Greenland ice sheet and part of Antarctica could be undergoing irreversible decline.

Man is doing an experiment with the ice sheets, which is a scientifically interesting experiment, except it is going to have some serious consequences, he said. cheap longchamp bags