Climate strategy with CO2 capture from the air

David Keith, Minh Ha-Duong and Joshua Stolaroff
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Joshua Stolaroff: Department of Engineering and Public Policy, Carnegie Mellon University - CMU - Carnegie Mellon University [Pittsburgh]

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Abstract: immobilize it in geological structures. Air capture differs from conventional mitigation in three key aspects. First, it removes emissions from any part of the economy with equal ease or difficulty, so its cost provides an absolute cap on the cost of mitigation. Second, it permits reduction in concentrations faster than the natural carbon cycle: the effects of irreversibility are thus partly alleviated. Third, because it is less coupled with existing energy infrastructure, air capture may offer stronger economies of scale and smaller adjustment costs than the more conventional mitigation technologies.We assess the ultimate physical limits on the amount of energy and land required for air capture and describe two systems that might achieve air capture at prices under 200 $/tC using current technology.Like geoengineering, air capture limits the cost of a worst-case climate scenario. In an optimal sequential decision framework with uncertainty, existence of air capture decreases the need for near-term precautionary abatement. The long-term abatement effect is the opposite, assuming that marginal cost of mitigation decreases with time, while marginal climate change damage increases. With air capture this implies an environmental Kuznets curve, returning towards preindustrial concentration levels of greenhouse gases.

Keywords: Capture du carbone; changement climatique; modélisation intégrée; politique climatique; Carbon sequestration; climate change; integrated assessment; climate policy; carbon capture (search for similar items in EconPapers)
Date: 2006
Note: View the original document on HAL open archive server: https://shs.hal.science/halshs-00003926v1
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Published in Climatic Change, 2006, 74 (1-3), pp.17-45. ⟨10.1007/s10584-005-9026-x⟩

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Persistent link: https://EconPapers.repec.org/RePEc:hal:journl:halshs-00003926

DOI: 10.1007/s10584-005-9026-x

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