10.10.2021

# New Publications

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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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30.09.2021

# Calls & events

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Call for Abstracts: 2nd International Conference on Negative CO2 Emissions

Deadline: 1. December 2021

"The objective of the Paris Agreement is to limit global warming to well below 2ºC, and to pursue efforts to limit the temperature increase to 1.5ºC. The carbon budget is the amount of carbon dioxide that we can emit while still limiting global temperature rise to a given level, for example 1.5ºC.The exact size of the carbon budget is uncertain and depends on many factors, including potential future warming of non-CO2 climate forcers. This said, the remaining budgets for limiting the warming to 1.5ºC or 2ºC have been estimated at about 420 and 1170 Gt of CO2 . With unchanged present emissions at about 40 Gt CO2/year these budgets would be exhausted in as few as 10 and 30 years, respectively. Most of the IPCC emission scenarios that meet a global two-degree target in 2100 overshoot the carbon budget at first and then remove the excess carbon with large negative emissions, typically on the order of 400‑800 Gt CO2 up to 2100.At the same time as negative emissions appear to be indispensable to meet adopted climate targets, the large future negative emissions assumed in climate models have been questioned and warnings have been raised about relying on very large and uncertain negative emissions in the future. With the future climate at stake, a deeper and fuller understanding of the various aspects of negative emissions is needed."

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27.09.2021

# New Publications

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Jia, Xiaoping; et al. (2021): Regional carbon drawdown with enhanced weathering of non-hazardous industrial wastes

Jia, Xiaoping; Zhang, Zetian; Wang, Fei; Li, Zhiwei; Wang, Yutao; Aviso, Kathleen B. et al. (2021): Regional carbon drawdown with enhanced weathering of non-hazardous industrial wastes. In Resources, Conservation and Recycling 176, p. 105910. DOI: 10.1016/j.resconrec.2021.105910.

"Countries around the world are taking active efforts to address the current climate crisis. Negative emissions technologies (NET) such as enhanced weathering will play a significant role in these efforts in the coming decades. Enhanced weathering is based on the terrestrial application of powdered natural or synthetic silicate minerals to remove carbon dioxide (CO2) from the atmosphere. In the latter case, non-hazardous industrial waste (NHIW) can react with water and CO2 from the atmosphere to achieve carbon drawdown through the acceleration of the naturally occurring weathering process. This approach also addresses the problem of sustainable industrial waste management. Besides, carbon drawdown also enhances soil quality for agricultural application sites. In the future, planning the large-scale implementation of enhanced weathering via carbon management networks can be facilitated by using optimization models. In this work, a source-sink model is developed for the proper allocation of NHIW to application sites."

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25.08.2021

# New Publications

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Gernon, Thomas M.; et al. (2021): Global chemical weathering dominated by continental arcs since the mid-Palaeozoic

Gernon, Thomas M.; Hincks, Thea K.; Merdith, Andrew S.; Rohling, Eelco J.; Palmer, Martin R.; Foster, Gavin L. et al. (2021): Global chemical weathering dominated by continental arcs since the mid-Palaeozoic. In: Nat. Geosci. 28, S. 611. DOI: 10.1038/s41561-021-00806-0.

"Earth’s plate-tectonic activity regulates the carbon cycle and, hence, climate, via volcanic outgassing and silicate-rock weathering. Mountain building, arc–continent collisions and clustering of continents in the tropics have all been invoked as controlling the weathering flux, with arcs also acting as a major contributor of carbon dioxide to the atmosphere. However, these processes have largely been considered in isolation when in reality they are all tightly coupled. To properly account for interactions among these processes, and the inherent multi-million-year time lags at play in the Earth system, we need to characterize their complex interdependencies. Here we analyse these interdependencies over the past 400 million years using a Bayesian network to identify primary relationships, time lags and drivers of the global chemical weathering signal."

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20.08.2021

# New Publications

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Vakilifard, Negar; et al. (2021): The role of enhanced rock weathering deployment with agriculture in limiting future warming and protecting coral reefs

Vakilifard, Negar; Kantzas, Euripides P.; Neil R, Edwards; Holden, Philip B.; Beerling, David J. (2021): The role of enhanced rock weathering deployment with agriculture in limiting future warming and protecting coral reefs. In Environ. Res. Lett. 16 (9), p. 94005. DOI: 10.1088/1748-9326/ac1818.

"Meeting the net-zero carbon emissions commitments of major economies by mid-century requires large-scale deployment of negative emission technologies (NETs). Terrestrial enhanced rock weathering on croplands (ERW) is a NET with co-benefits for agriculture, soils and ocean acidification that creates opportunities for generating income unaffected by diminishing carbon taxes as emissions approach net-zero. Here we show that ERW deployment with croplands to deliver net 2 Gt CO2 yr−1 removal approximately doubles the probability of meeting the Paris 1.5 °C target at 2100 from 23% to 42% in a high mitigation Representative Concentration Pathway 2.6 baseline climate."

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12.08.2021

# New Publications

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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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02.08.2021

# Media

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mdr: Stopping climate change? Researchers want to draw CO2 from the atmosphere using basalt rock dust (German)

German article on enhanced weathering.

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02.08.2021

# New Publications

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Goll, Daniel S.; et al. (2021): Potential CO2 removal from enhanced weathering by ecosystem responses to powdered rock

Goll, Daniel S.; Ciais, Philippe; Amann, Thorben; Buermann, Wolfgang; Chang, Jinfeng; Eker, Sibel et al. (2021): Potential CO2 removal from enhanced weathering by ecosystem responses to powdered rock. In Nat. Geosci., pp. 1–5. DOI: 10.1038/s41561-021-00798-x.

" Here we explore soil amendment with powdered basalt in natural ecosystems."

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28.07.2021

# New Publications

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Goll, Daniel S.; et al. (2021): Potential CO2 removal from enhanced weathering by ecosystem responses to powdered rock

Goll, Daniel S.; Ciais, Philippe; Amann, Thorben; Buermann, Wolfgang; Chang, Jinfeng; Eker, Sibel et al. (2021): Potential CO2 removal from enhanced weathering by ecosystem responses to powdered rock. In Nat. Geosci., pp. 1–5. DOI: 10.1038/s41561-021-00798-x.

"Here we explore soil amendment with powdered basalt in natural ecosystems."

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19.07.2021

# Calls & events

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Job: Postdoctoral Researcher Soil Geochemistry/Chemistry (University of California, Berkeley)

No Deadline

"The Pallud Lab is hiring a Postdoctoral Research Fellow to investigate a new verification scheme for enhanced rock weathering application in agricultural soils in soil column lab experiments."

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