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A handout photo from Science shows an iceberg in North Bay, Rothera Point, Adelaide Island, Antarctica. Runoff from ice caps in Antarctica and Greenland along with melting mountain glaciers have replaced expanding oceans as the main driver of rising sea levels, according to a new study(AFP/HO/File/Pete Bucktrout)AFP - Runoff from ice caps in Antarctica and Greenland along with melting mountain glaciers have replaced expanding oceans as the main driver of rising sea levels, according to a new study.