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Antarctic ice loss "passed the point of no return": scientists

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May 13 - Vast glaciers in West Antarctica seem to be locked in an irreversible thaw linked to global warming that may push up sea levels for centuries, according to scientists. A new study by researchers at NASA's Jet Propulsion Laboratory and the University of California, Irvine, says the glaciers have "passed the point of no return" and there is nothing to stop the entire glacial basin from melting into the sea. Rob Muir reports.