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Climatologists cannot agree whether or not the world is experiencing a greenhouse warming. James Hansen is confidant that the warming is taking place. According to three major measures, 1990 was the hottest year on record (globe was 0. 45degreesC warmer than normal) with Greenland being the only place below normal. Ocean surface temperatures were measured to be 0. 39degreesC above normal, and air temperatures at altitudes of 1. 5 and 9 kilometers were 0. 02degreesC above the previous record set in 1988. Hansen claims that the surface temperature elevations measured roughly conform with projections made by his climate model.
Richard A. Kerr (Fri,) studied this question.