In the sweltering summer of 1988 the public heard claims that global warming from the greenhouse effect had definitely begun. In the chilly winter of 1989/90 they are hearing skeptics question whether it will ever arrive. Just as temperatures fluctuate about an average value, the mean opinion on global warming falls somewhere between these extremes.
Barbara Goss Levi; Climate Modelers Struggle to Understand Global Warming. Physics Today 1 February 1990; 43 (2): 17–19. https://doi.org/10.1063/1.2810435
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