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View submission: Ask Anything Wednesday - Physics, Astronomy, Earth and Planetary Science
The mass gained by conversion of light energy to mass by photosynthesis is largely balanced out by heat radiated out when that mass is metabolized or otherwise decays--really on net the earth is losing energy as heat trapped in the interior gradually escapes. More significant is loss of atmospheric gasses like hydrogen to continuous escape off the top of the atmosphere, but this is still at far too low a rate to make much of a dent in the planet's total mass even over billions of years.
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