The melting of the Greenland Ice Sheet contributes significantly to global sea level rise.

My recent post on a geoengineering attempt to increase arctic sea ice sparked a lot of pushback from a number of people, some perhaps suffering from misinformation but unequivocally others propagandizing with disinformation. The concept they floated was the idea that measuring arctic sea ice trends was inferior to measuring all northern hemispheric sea ice—which they argued was not diminishing over time. But of greater import is the accelerating loss of the Greenland Ice Sheet [GIS]. Truthfully, I am not sure why they are fixated on the sea ice when the huge mass of ice on Greenland would raise sea level by 7.4 meters = 23 feet. Its current melting is contributing about 1/5 of sea level rise [SLR]. Note that this graph is up to date thru March of 2026. So, I reiterate, the British economist John Maynard Keynes once retorted to naysayers: “When I receive new information I change my thinking. And you, sir, what do you do?”

My recent post on a geoengineering attempt to increase arctic sea ice sparked a lot of pushback from a number of people, some perhaps suffering from misinformation but unequivocally others propagandizing with disinformation. The concept they floated was the idea that measuring arctic sea ice trends was inferior to measuring all northern hemispheric sea ice—which they argued was not diminishing over time. But why restrict ourselves to the northern hemisphere? The graphic I am posting here is from the National Snow and Ice Data Center [NSIDC]. The interval runs from 1979 through 2026, measuring the extent of ice in March. Not to belabor the obvious, March in the northern hemisphere is the typical high point for ice at the end of winter, while March in the southern hemisphere is the typical low point for ice at the end of summer. Essentially all of these data are from satellite surveillance. Note that the decadal trend is -2.20% Note the areal decadal trend is -0.42 million square km. The British economist John Maynard Keynes once retorted to naysayers: “When I receive new information I change my thinking. And you, sir, what do you do?”