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We really need a global carbon credit system (with stiff tariffs for countries that do not participate). Cut net greenhouse emissions by a few percent a year until net emissions are negative and atmospheric CO2 and methane are back to pre-industrial levels. This will help renewables (and nuclear, for better or worse) in the short term. In the medium term, the invisible hand of the market will make carbon capture profitable, which means smart VCs will start dumping cash into it now.

I think this sounds more plausible than terraforming, but is really the same thing.

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