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Costs of carbon sequestration range from about $20 to $70 per tonne, as part of exhaust capture (CCS). For direct capture from the atmosphere, values are closer to $150/tonne.

The world is dumping 38 billion tonnes of CO2 into the atmosphere every year. (I'll ignore the additional gigatonnes we've already committed.)

That's $2.6 trillion per year for sequestration, just to stay even. (The value's actually lower than I'd expected.)

For comparison, global GDP is about $70 trillion, so this is 3% of global GDP.



You also have to keep in mind that it's this expensive because it's not done on a huge scale. If it was, the cost would very likely be much much lower than the quoted $150.

The costs are dominated by the chemical energy requirements, as I understand. They seem unlikely to fall greatly.

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