Variability of the Earth’s climate
The geothermal gradient delivers about 61.5 mW/m2 from the interior of the Earth to the surface. Since the surface area of the Earth¼5.1_108 km2, the rate at which energy is released from the interior of the Earth is 3.1_1010 kW. The solar power that impinges on the Earth is 342W/m2. If all of this were absorbed, the Earth would receive 1.7_1014 kW. Actually, only about 70% of the incident solar energy is absorbed by the Earth; nevertheless, the solar input far exceeds that which derives from the interior. Therefore geothermal energy may be ignored in dealing with the heat balance of the Earth.
KeywordsLast Glacial Maximum Climate Sensitivity Continental Drift Global Average Temperature Ancient Climate
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