@ScottAdamsSays Heat produced directly (from your furnace) radiates into space. It does add to avg temp of universe but Earth is small, space is big. Our furnaces can’t measurably affect temp of space.
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I think the answer is that heat produced on the earth does not increase temperature due to conservation of energy. Temperature on earth increases only from energy that comes from outside the system (absorbed solar radiation). https://www.texasgateway.org/resource/law-conservation-energy-heat-transfer …
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Earth is in thermal balance with universe: Heat radiated from earth = heat received from Sun. We receive 4 x 10^24 Joule from sun per year and emit almost the same.
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Our total energy production is 5 x 10^14 Joule, i.e. we receive 10,000,000,000 times more energy from the sun than we produce. Burning more fossil fuel is such an infinitesimal change that it can't affect temperature
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If you burn a candle in a room, air will be room temp not far from it. If you burn a candle in a well-insulated box, air in the box can get much hotter.
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