Thursday, March 20, 2008


Some very interesting observations on the surprising relationship global damming has on rising sea levels.

Sea levels have been rising for decades, due mostly to global warming caused by greenhouse gases.

The oceans are on average about 6.3 inches (16 centimeters) higher now than in 1930, when they started a noticeable upward climb. Melting glaciers and ice caps, along with ocean warming—water expands as it heats up—are the main culprits behind the increase.

But the new study shows that reservoirs are also an important factor. Rather than adding to sea-level rise, however, they have counteracted it by storing more water on land.

Since 1930 the storage of water has prevented a total of about 1.2 inches (3 centimeters) of sea-level rise.

Without dams, sea levels would have risen 30 percent more than they already have, according to research led by Benjamin Chao of National Central University in Taiwan.

Chao and colleagues report their findings in tomorrow's issue of the journal Science.

more reading at National Geographic

image: Reuters

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