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Potential for large-scale CO2 removal via enhanced rock weathering with croplands Beerling, David J.; Kantzas, Euripides P.; Lomas, Mark R.; Wade, Peter; Eufrasio, Rafael M.; Renforth, Phil; Sarkar, Binoy; Andrews, M. Grace; James, Rachael H.; Pearce, Christopher R.; Mercure, Jean-Francois; Pollitt, Hector; Holden, Philip B.; Edwards, Neil R.; Khanna, Madhu; Koh, Lenny; Quegan, Shaun; Pidgeon, Nick F.; Janssens, Ivan A.; Hansen, James; Banwart, Steven A. (2020). Potential for large-scale CO2 removal via enhanced rock weathering with croplands. Nature (Lond.) 583(7815): 242-248. https://dx.doi.org/10.1038/s41586-020-2448-9 In: Nature: International Weekly Journal of Science. Nature Publishing Group: London. ISSN 0028-0836; e-ISSN 1476-4687, meer Is gerelateerd aan: Lehmann, J.; Possinger, A. (2020). Atmospheric CO2 removed by rock weathering. Nature (Lond.) 583(7815): 204-205. https://dx.doi.org/10.1038/d41586-020-01965-7, meer

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VLIZ: Non-open access 347426 [ aanvragen ]

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Abstract

Enhanced silicate rock weathering (ERW), deployable with croplands, has potential use for atmospheric carbon dioxide (CO2) removal (CDR), which is now necessary to mitigate anthropogenic climate change1. ERW also has possible co-benefits for improved food and soil security, and reduced ocean acidification. Here we use an integrated performance modelling approach to make an initial techno-economic assessment for 2050, quantifying how CDR potential and costs vary among nations in relation to business-as-usual energy policies and policies consistent with limiting future warming to 2 degrees Celsius. China, India, the USA and Brazil have great potential to help achieve average global CDR goals of 0.5 to 2 gigatonnes of carbon dioxide (CO2) per year with extraction costs of approximately US$80–180 per tonne of CO2. These goals and costs are robust, regardless of future energy policies. Deployment within existing croplands offers opportunities to align agriculture and climate policy. However, success will depend upon overcoming political and social inertia to develop regulatory and incentive frameworks. We discuss the challenges and opportunities of ERW deployment, including the potential for excess industrial silicate materials (basalt mine overburden, concrete, and iron and steel slag) to obviate the need for new mining, as well as uncertainties in soil weathering rates and land–ocean transfer of weathered products.

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