Abstract
Professor LaMont C. Cole's paper on Thermal Pollution in your November issue presents some very valuable but somewhat mystifying projections of the thermal effect of the continued increase in energy use. My calculations confirm the 91 year span for a 1 C increase in temperature. Unless some unexplained new factors are introduced, I calculate, on the basis of the 7% per year increase in energy use continuing, that the time for a 3 C increase would be about 108 years (rather than 780 years) while the 15 C increase to a mean temperature of 30 C would require about 130 years (rather than 980 years). If the specific heat to warm the earth's crust and melt the ice is taken into account, a few extra years would be needed but the time spans would still remain in the century to century-and-a-half range before we would face disaster.
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