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xkcd : Earth Temperature Timeline
(imgs.xkcd.com)
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this post was submitted on 11 Oct 2023
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Earth, Environment, and Geosciences
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Use the renewable and nuclear energy to remove the IR shield in the atmosphere (store atmospheric carbon in the ground), rather than put a shield in space. A space shield doesn't address CO2 levels in the atmosphere or oceans.
It's just a question of scale and thermodynamics. Using the renewables to do carbon capture is probably a good idea, because anything is better than the giant greenhouse gas. But that really is geoengineering too. And it'll only work for a period. As energy use increases, you will modify the planet more and more simply due to collecting and distributing the energy. Energy must flow from concentrated forms to dispersed forms. That dispersed form is usually heat.