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[QUOTE]Originally posted by The Bigfoot: [QB] OilDog, I know my facts. You have correctly stated that Venice is sinking. However, you are incorrect in taking that as evidence that it means the surrounding waters are not rising. Here is an excerpt from a Science News article if you would like to learn. [QUOTE] Ammerman and his colleagues have spent the past decade trying to uncover the early archaeological levels in the lagoon. At three sites in Venice, and on two nearby islands, they used carbon-14 techniques to date buried structures. By measuring the position of these objects relative to current water levels, the researchers could estimate how quickly the city has sunk since its founding. In a related effort, Charles E. McClennen, a marine geologist at Colgate, has traced the history of the lagoon itself by using sonar to penetrate its sedimentary layers. The lagoon started to form 6,000 years ago, [b]and the water has risen 5 m since then[/b] , he determined. In the June ANTIQUITY, the researchers combine their evidence to estimate how rates of sea level rise have changed over time. For the first 4,000 years after the birth of the lagoon, the water surface at the site of Venice rose relatively slowly, at a rate of 7 centimeters per century. Around 400 A.D., people moved into the lagoon and settled on marginal marshgrass islands, which flooded during the highest tides. To stay above water, these pioneers built up the islands with boatloads of sand. Later, Venetians started driving innumerable wooden piles down into the sediment, forming level foundations on which to build the growing city. One existing church, according to records, Rests on 1.1 million of these timbers. Such efforts sparked a never-ending war with the water. As a result of the added weight on the islands, they began to sink and local water levels started increasing faster than before. From 400 A.D. until the end of the 1800s, the sea rose at about 13 cm per century, report the scientists. [b]This century, the rate jumped even further. Tide-gauge records indicate that sea level at Venice has risen 25 cm, driven in part by the water extraction and the global sea level rise spurred by increasing worldwide temperatures.[/b] As the archaeological data show, early residents fought back by continually building up the ground surface, covering over earlier levels of the city, says Ammerman. Daniel J. Stanley, a coastal geologist with the Smithsonian Institution in Washington, D.C., compares Venice to a man standing in a swimming pool. "His feet are embedded in lead and the water level in the pool is rising and it's already to his nose. He better not make any waves," says Stanley. Conservative estimates of greenhouse warming suggest that global sea levels will climb between 38 and 55 cm by the end of the next century. "That doesn't augur well for the city of Venice," says Stanley. Science News, July 24, 1999 by Richard Monastersky [/QUOTE] [/QB][/QUOTE]
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