Science and technology

Associated Press
FILE - A tourist sits outside a cafe in a flooded St. Mark square as high tides reached 1.05 meters above sea level, partly flooding the city of Venice, Italy on Monday, Oct. 15, 2012. The Lagoon City, a system of islands built into a river delta, is extremely vulnerable to rising sea levels. At the same time it is experiencing a lowering of the sea floor. The constant flooding puts the city's considerable architectural treasures at risk. (AP Photo/Luigi Costantini)

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