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Arctic Ice may Be Free by 2030 If Sea Levels Continue to Rise

by Rajshri on  June 13, 2008 at 3:34 PM Environmental Health   - G J E 4
 Arctic Ice may Be Free by 2030 If Sea Levels Continue to Rise
Rising sea levels across the world may mean that all of the Arctic ice may be free by 2030, scientists have warned urging immediate action to tackle climate change.
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According to a report in ENN (Environmental News Network), researchers were astounded when, in the fall of 2007, they discovered that the year-round ice pack in the Arctic Ocean had lost some 20 percent of its mass in just two years, setting a new record low since satellite imagery began documenting the terrain in 1978.

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This massive reduction has allowed an ice-free shipping lane to open through the fabled Northwest Passage along northern Canada, Alaska and Greenland.

While the shipping industry, which now has easy northern access between the Atlantic and Pacific oceans, may be cheering this "natural" development, scientists worry about the impact of the resulting rise in sea levels around the world.

With about a third of the world's population living within 300 feet of an ocean coastline, sea level rise is a big deal.

According to the Intergovernmental Panel on Climate Change, made up of leading climate scientists, sea levels have risen some 3.1 millimeters per year since 1993.

The World Wildlife Fund (WWF) reports that low-lying island nations, especially in equatorial regions, have been hardest hit by this phenomenon, and some are threatened with total disappearance. Rising seas have already swallowed up two uninhabited islands in the Central Pacific.

On Samoa, thousands of residents have moved to higher ground as shorelines have retreated by as much as 160 feet.

According to the WWF, rising seas throughout tropical and sub-tropical regions of the world have inundated coastal ecosystems, decimating local plant and wildlife populations.

In Bangladesh and Thailand, coastal mangrove forests, important buffers against storms and tidal waves, are giving way to ocean water.

Unfortunately, even if we curb global warming emissions today, these problems are likely to get worse before they get better.

According to marine geophysicist Robin Bell of Columbia University's Earth Institute, sea levels rise by about 1/16" for every 150 cubic miles of ice that melts off one of the poles.

"That may not sound like a lot, but consider the volume of ice now locked up in the planet's three greatest ice sheets," she said.

"If the West Antarctic ice sheet were to disappear, sea level would rise almost 19 feet; the ice in the Greenland ice sheet could add 24 feet to that; and the East Antarctic ice sheet could add yet another 170 feet to the level of the world's oceans: more than 213 feet in all," she added.

Source: ANI
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