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@pezmico "Sequestration" is meaningless if it's not on a geological time scale, many millions of years.

We don't know how to do that and the not-obviously-crazy approaches (pull CO2 from the air, make graphite from the carbon, back fill a coal mine with the graphite) not only have immense energy costs, we'd have to be confident some capitalist wouldn't see it as an opportunity to mine the graphite as high-quality thermal fuel.

So, yeah, scam.