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FILE - In this Nov. 1, 2012 file photo, people walk in high water near the Ponte delle Guglie in Venice, Italy, as high tides flooding the city force Venetians and tourists to don boots and navigate normally dry areas on wooden walkways. In 2012 many of the warnings scientists have made about global warming went from dry studies in scientific journals to real-life experience. (AP Photo/Luigi Costantini, File)

Associated Press
FILE - In this Nov. 1, 2012 file photo, people walk in high water near the Ponte delle Guglie in Venice, Italy, as high tides flooding the city force Venetians and tourists to don boots and navigate normally dry areas on wooden walkways. In 2012 many of the warnings scientists have made about global warming went from dry studies in scientific journals to real-life experience. (AP Photo/Luigi Costantini, File)
FILE - In this Nov. 1, 2012 file photo, people walk in high water near the Ponte delle Guglie in Venice, Italy, as high tides flooding the city force Venetians and tourists to don boots and navigate normally dry areas on wooden walkways. In 2012 many of the warnings scientists have made about global warming went from dry studies in scientific journals to real-life experience. (AP Photo/Luigi Costantini, File)
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