New research published this week in the journal Geophysical Research Letters found that carbon emissions are halfway to a tipping point after which 6 feet of sea level rise from the melting of the Greenland Ice Sheet would be unstoppable. The second tipping point noted in the research would occur once 2,500 gigatons of carbon emissions have been released into the atmosphere, at which point the whole Greenland Ice Sheet will melt and sea level rise would rise by 6. Global Business and Financial News, Stock Quotes, and Market Data and Analysis