Water levels in the world's rivers and oceans rose 18% over a 13-year period ending in 2006, due in part to melting polar ice sheets, according to a scientific analysis by the University of California, Irvine. The so-called water-cycle acceleration could result in more water availability, but it will likely lead to more extreme wet and dry climates around the world, a sign of global warming, the study's lead author said.

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