Schlagwort: soil carbon sequestration

Soil carbon and cover crops

by Nori – Carbon Removal Newsroom at Spotify

In this week’s science-focused episode of Carbon Removal Newsroom, hosts of Nori joined once again by co-host, the executive director of the faculty in crop and soil science at Colorado State University. They are looking at two recently published studies which explore the challenges and opportunities around managing croplands and rangelands to draw down and store atmospheric carbon while making agriculture more sustainable.

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Nature – Pellegrini et al. (2021): Fire effects on the persistence of soil organic matter and long-term carbon storage

Adam F. A. Pellegrini, Jennifer Harden, Katerina Georgiou, Kyle S. Hemes, Avni Malhotra, Connor J. Nolan, Robert B. Jackson IN: Nature Geoscience (2021), https://doi.org/10.1038/s41561-021-00867-1

The authors review recent advances to illustrate that fire-driven changes in decomposition, mediated by altered soil organic matter (SOM) stability, are an important compensatory process offsetting declines in aboveground biomass pools. Given that 70% of global topsoil C is in fire-prone regions, using fire to promote SOM stability may be an important nature-based climate solution to increase C storage.

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Haque, Fatima; et al. (2021): Urban Farming with Enhanced Rock Weathering As a Prospective Climate Stabilization Wedge

Haque, Fatima; Santos, Rafael M.; Chiang, Yi Wai (2021): Urban Farming with Enhanced Rock Weathering As a Prospective Climate Stabilization Wedge. In Environmental science [&] technology. DOI: 10.1021/acs.est.1c04111.

„With no single carbon capture and sequestration solution able to limit the global temperature rise to 1.5–2.0 °C by 2100, additional climate stabilization measures are needed to complement current mitigation approaches. Urban farming presents an easy-to-adopt pathway toward carbon neutrality, unlocking extensive urban surface areas that can be leveraged to grow food while sequestering CO2. Urban farming involves extensive surface areas, such as roofs, balconies, and vertical spaces, allowing for soil presence and atmospheric carbon sequestration through air-to-soil contact. In this viewpoint we also advocate the incorporation of enhanced rock weathering (ERW) into urban farming, providing a further opportunity for this recognized negative emissions technology that is gaining momentum worldwide to gain greater utilization.“

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GreenBiz: U.S. infrastructure bill lays foundation for carbon management economy

„It’s not the law of the land yet, but one of the most potentially impactful aspects of the bipartisan infrastructure bill for climate techies is the groundwork it lays for new economic opportunities based on capturing and sequestering carbon emissions. The support for the so-called carbon management economy takes many shapes within the bill, and is largely based on the SCALE Act reintroduced earlier this year by senators on both sides of the aisle. (SCALE stands for Storing CO2 and Lowering Emissions).“

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Illuminem: Time to Rethink Nature-Based Solutions?

„It has been more than 30 years since the first carbon offset project used a nature-based solution (agroforestry and forestry conservation) to offset the emissions of a coal-fired power plant owned by the energy company AES. I developed the carbon quantification methodology for that offset project while at the World Resources Institute in Washington, DC. I subsequently authored some of the earliest studies looking at nature-based solutions (NBS) potentials for climate change mitigation, and worked extensively with the Intergovernmental Panel on Climate Change (IPCC) on the topic.[…] NBS references a large category of climate change mitigation options based on preserving, restoring, or expanding biological stores of terrestrial or oceanic carbon. Protecting tropical rainforests, rewilding temperate zones, restoring soil carbon on agricultural lands, and sinking seaweed into the ocean are all examples of NBS options.“

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Renforth, P.; Campbell, J. S. (2021): The role of soils in the regulation of ocean acidification

Renforth, P.; Campbell, J. S. (2021): The role of soils in the regulation of ocean acidification. In Philosophical transactions of the Royal Society of London. Series B, Biological sciences 376 (1834), p. 20200174. DOI: 10.1098/rstb.2020.0174.

„Increasing the alkalinity levels in the ocean through enhanced weathering could help to ameliorate the effects of ocean acidification in two ways. First, enhanced weathering would slightly elevate the pH of drainage waters, and the receiving coastal waters. The elevated pH would result in an increase in carbonate mineral saturation states, and a partial reversal in the effects of elevated CO2. Second, the increase in alkalinity would help to replenish the ocean’s buffering capacity by maintaining the ‘Revelle Factor’, making the oceans more resilient to further CO2 emissions. However, there is limited research on the downstream and oceanic impacts of enhanced weathering on which to base deployment decisions.“

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Power, Ian M.; et al. (2021): Carbonation, Cementation, and Stabilization of Ultramafic Mine Tailings

Power, Ian M.; Paulo, Carlos; Long, Hannah; Lockhart, Justin A.; Stubbs, Amanda R.; French, David; Caldwell, Robert (2021): Carbonation, Cementation, and Stabilization of Ultramafic Mine Tailings. In Environmental science [&] technology 55 (14), pp. 10056–10066. DOI: 10.1021/acs.est.1c01570.

„A promising approach for de-risking brucite-bearing ultramafic tailings is in situ cementation via carbon dioxide (CO2) mineralization, which also sequesters this greenhouse gas within carbonate minerals. In cylindrical test experiments, brucite [Mg(OH)2] carbonation was accelerated by coupling organic and inorganic carbon cycling. Waste organics generated CO2 concentrations similar to that of flue gas (up to 19%).“

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Sweet, Shannan K.; et al. (2021): Perceptions of naturalness predict US public support for Soil Carbon Storage as a climate solution

Sweet, Shannan K.; Schuldt, Jonathon P.; Lehmann, Johannes; Bossio, Deborah A.; Woolf, Dominic (2021): Perceptions of naturalness predict US public support for Soil Carbon Storage as a climate solution. In Climatic Change 166 (1-2), pp. 1–15. DOI: 10.1007/s10584-021-03121-0.

„We analyzed data from a national probability survey of 1222 US adults who reported believing in climate change at least “somewhat” to estimate public support for Soil Carbon Storage and how it compares to other leading Carbon Dioxide Removal (CDR) strategies.“

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