Alignment of industry, regulation and academia for quantification of carbon dioxide removal by enhanced weathering
- 1InPlanet GmbH, München, Germany (christina.larkin@inplanet.earth)
- 2Department of Earth and Planetary Sciences, Yale University, New Haven, CT, United States of America
- 3Yale Center for Natural Carbon Capture, Yale University, New Haven, CT, United States of America
- 4RMI, 22830 Two Rivers Road, Basalt, CO 81621, USA
- 5Research Center for Carbon Solutions, Heriot-Watt University, Edinburgh, EH14 4AS, UK
Terrestrial enhanced weathering (EW) is a promising emerging carbon dioxide removal technique which involves the acceleration of natural weathering processes via the deployment of crushed rock feedstocks, typically Ca- and Mg-rich silicates, in soils. While models predict this has the potential to remove multiple gigatonnes of CO2 annually1,2, as an open-system pathway, the measurement (monitoring), reporting, and verification (MRV) of carbon removal and storage is challenging3. We will review the current literature showing the state-of-play of different methods for monitoring EW, as well as outlining links between industry, regulation and academia. Additionally, we outline a set of enhanced weathering carbon definitions in order to align academic studies and emergent industry in this area with the established voluntary carbon offset market.
We will discuss two main pathways for measuring EW, one focused on solid phase measurements4 and the other on the aqueous phase3,5. Additionally, gas phase measurements have been deployed to understand CO2 fluxes, but are dominated by short-term organic carbon cycling. We emphasise that, although there is complexity in tracing EW CDR in the natural field environment, established literature validates existing approaches, and each measurement approach has strengths and limitations. The complexity inherent in EW is navigable through redundant measurement strategies and well designed experiments, which we highlight are crucial in the nascent stages of the EW industry.
1Taylor, L. L. et al. Nat. Clim. Change 6, 402–406 (2016)
2Beerling, D. J. et al. Nature 583, 242–248 (2020)
3Clarkson, M. O. et al. preprint EarthArXiv (2023)
4Reershemius, T., Kelland, M.E., et al.. Environ. Sci. Technol. (2023)
5Larkin, C. S. et al. Front. Clim. 4, (2022).
How to cite: Larkin, C., Clarkson, M., Swoboda, P., Reershemius, T., Suhrhoff, T. J., Maesano, C., and Campbell, J.: Alignment of industry, regulation and academia for quantification of carbon dioxide removal by enhanced weathering, EGU General Assembly 2024, Vienna, Austria, 14–19 Apr 2024, EGU24-17266, https://doi.org/10.5194/egusphere-egu24-17266, 2024.
