A good friend sent me a web page on glaciers and ice sheets. It is based on data from several government and UN sources. The web page sponsor is an environmental non-profit.
Either no one proofread the material or they didn't know arithmetic.
I suspect the latter is true of most believers in global warming.
The web page doesn't give data on the portion of the global ice sheet that is
in Greenland, but for the combined Greenland and Antarctica ice sheets they
claim 30 million cubic kilometers of ice. Greenland is roughly 2 million
square kilometers and Antarctica is about 13 million. Greenland is 15% the size of Antarctica. Greenland is probably less than 4 million
cubic kilometers of ice, by using those two numbers.
The image on the right shows the additions and subtractions from the Greenland ice sheet annually. The web page claims that there is a net decrease of 53 cubic kilometers of ice per year in Greenland. They are talking about 53 cubic kilometers out of 4 million cubic kilometers. The idea that anyone could measure 53 cubic kilometers of net ice melt per year (.00001, one hundred thousandths of the total) is absurd.
The further idea that this incredibly insignificant amount of ice from the net melt of Greenland could create a trend of .005 inch per year rise in the oceans is even more absurd. That would be .5 inch in a century. Half an inch increase in a century in oceans that already vary with tidal action by 45 inches twice a day every day is quite hard to picture as a global danger.