An inter-model assessment of the role of direct air capture in deep mitigation pathways

Giulia Realmonte (), Laurent Drouet, Ajay Gambhir, James Glynn, Adam Hawkes, Alexandre C. Köberle and Massimo Tavoni
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Giulia Realmonte: Centro Euro-Mediterraneo sui Cambiamenti Climatici
Ajay Gambhir: Grantham Institute
James Glynn: University College Cork
Adam Hawkes: Grantham Institute
Alexandre C. Köberle: Grantham Institute
Massimo Tavoni: Centro Euro-Mediterraneo sui Cambiamenti Climatici

Nature Communications, 2019, vol. 10, issue 1, 1-12

Abstract: Abstract The feasibility of large-scale biological CO2 removal to achieve stringent climate targets remains unclear. Direct Air Carbon Capture and Storage (DACCS) offers an alternative negative emissions technology (NET) option. Here we conduct the first inter-model comparison on the role of DACCS in 1.5 and 2 °C scenarios, under a variety of techno-economic assumptions. Deploying DACCS significantly reduces mitigation costs, and it complements rather than substitutes other NETs. The key factor limiting DACCS deployment is the rate at which it can be scaled up. Our scenarios’ average DACCS scale-up rates of 1.5 GtCO2/yr would require considerable sorbent production and up to 300 EJ/yr of energy input by 2100. The risk of assuming that DACCS can be deployed at scale, and finding it to be subsequently unavailable, leads to a global temperature overshoot of up to 0.8 °C. DACCS should therefore be developed and deployed alongside, rather than instead of, other mitigation options.

Date: 2019
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DOI: 10.1038/s41467-019-10842-5

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