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The Discovery of Global Warming                   January 2011
Ice loss from Greenland as measured by the GRACE satellite instrument, which can detect the slight shift in gravity as mass declines. Greenland is gaining some ice inland, due to increased snowfall, but it is losing more ice through melting and glacier discharge around its periphery. The scale is total mass relative to the average value 2002–2010. Ice loss began around 2000; since then the rate of loss has doubled. (The curve for Antarctica is similar, but noisier and less steep.)

Greenland ice loss

Data analyzed by John Wahr, University of Colorado, courtesy