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We need to capture about 1 trillion of tons of CO2 to return to sane levels, and then capture about 25 billion tons of CO2 annually. It looks doable.

See http://www.climatecentral.org/news/first-commercial-co2-capt... .

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That process absorbs CO2 from the atmosphere at low concentrations (400 ppm) onto stones coated with X-material. Later the stones are heated (using more fuel) to release CO2 at much higher concentrations (more than 75%). Then what? It is a gas. You need to bury the carbon. They suggest feeding it to greenhouses, to grow food, which re-releases it later.

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