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Sea Level Rise

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Submitted By shreenag
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Pages 3
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. Without action to stave off climate change, some scientists believe that, at that rate, all of the year-round ice in the Arctic could be gone by as early as 2030.
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.
The Impact of Rising Sea Levels
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. And the United Nations Environment Program predicts that, by 2010, some 80 percent of people will live within 62 miles of the coast, with about 40 percent living within 37 miles of a coastline.
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. And islanders on Tuvalu are scrambling to find new homes as salt water intrusion has made their groundwater undrinkable while increasingly strong hurricanes and ocean swells have devastated shoreline structures.
WWF says that rising sea levels 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 writes in a recent issue of Scientific American. “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.” Bell underscores the severity of the situation by pointing out that the 150-foot tall Statue of Liberty could be completely submerged within a matter of decades.
GOT AN ENVIRONMENTAL QUESTION? Send it to: EarthTalk, c/o E/The Environmental Magazine, P.O. Box 5098, Westport, CT 06881; submit it at: www.emagazine.com/earthtalk/thisweek/, or e-mail: earthtalk@emagazine.com.
EarthTalk is a regular feature of E/The Environmental Magazine. Selected EarthTalk columns are reprinted on About Environmental Issues by permission of the editors of E.
About Global Warming * Is Global Warming a Hoax? * What Causes Global Warming? * What is the Greenhouse Effect?
Global Warming and Health * Global Warming Leads to 150,000 Deaths Every Year * Global Warming May Kill Billions This Century * Global Water Supply Drying Up as Population Grows
World Conservation Issues * U.S. Lists Polar Bears as Threatened Species, but Fails to Ban Oil Drilling * Amazon Rainforest: Half of Remaining Rainforest Could Soon Disappear * Cross-Border Pollution: A Growing…...

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