Global Warming and Solar Radiation By D. Bruce Merrifield
"Without the impact of solar radiation, the temperature on the earth would be about the same as the temperature of space, which is about -454 F. The amount of radiation reaching the earth is about 1,368 watts per square meter. This is a vast amount of energy, which would require the simultaneous output of 1.7 billion of our largest power plants to match. About 70 percent of this solar energy is absorbed and 30 percent is reflected. However, the amount of solar energy reaching the earth is not constant, but varies in several independent cycles of different degrees of magnitude, which may or may not reinforce each other."
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