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The world's glaciers are shrinking and disappearing faster than scientists thought, with two-thirds of them projected to melt out of existence by the end of the century at current climate change trends, according to a new study. The study in the journal Science examined all of the globe's 215,000 land-based glaciers -- not counting those on ice sheets in Greenland and Antarctica -- more comprehensively than in past studies. Scientists then used computer simulations to calculate, using different levels of warming, how many glaciers would disappear, how many trillions of tons of ice would melt, and how much it would contribute to sea level rise. The study calculates that all that melting ice will add anywhere from 3.5 inches (90 millimeters) in the best case to 6.5 inches (166 millimeters) in the worst case to the world's sea level, 4 per cent to 14 per cent more than previous projections.