claim: The melting Greenland ice sheet is already a major contributor to rising sea level and if it was eventually lost entirely, the oceans would rise by six metres around the world, flooding many of the world’s largest cities.
evidence: If the entire 2,850,000 cubic kilometres ( 684,000 cu mi ) of ice were to melt, it would lead to a global sea level rise of 7.2 m ( 24 ft ).