30.09.2021

# Calls & events

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Call for Submissions: Technological Innovations and Climate Change: Negative Emissions Technologies

"The Environmental Audit Committee is conducting an overarching inquiry looking at technological innovations which could contribute to tackling climate change. The next aspect of the inquiry will look at Negative Emissions Technologies."

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29.09.2021

# Media

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Vice: 'Carbon Footprint' and 'Net Zero' Don't Mean What You Think

"Words that imply strong emission reduction policies have adopted slippery meanings intended to imply companies are doing more to reduce emissions than they actually are."

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27.09.2021

# New Publications

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Abernethy, S.; O'Connor, F. M.; Jones, C. D.; Jackson, R. B. (2021): Methane removal and the proportional reductions in surface temperature and ozone

Abernethy, S.; O'Connor, F. M.; Jones, C. D.; Jackson, R. B. (2021): Methane removal and the proportional reductions in surface temperature and ozone. In Phil. Trans. R. Soc. A 379 (2210), p. 20210104. DOI: 10.1098/rsta.2021.0104.

"Mitigating climate change requires a diverse portfolio of technologies and approaches, including negative emissions or removal of greenhouse gases. Previous literature focuses primarily on carbon dioxide removal, but methane removal may be an important complement to future efforts. Methane removal has at least two key benefits: reducing temperature more rapidly than carbon dioxide removal and improving air quality by reducing surface ozone concentration. While some removal technologies are being developed, modelling of their impacts is limited. Here, we conduct the first simulations using a methane emissions-driven Earth System Model to quantify the climate and air quality co-benefits of methane removal, including different rates and timings of removal. We define a novel metric, the effective cumulative removal, and use it to show that each effective petagram of methane removed causes a mean global surface temperature reduction of 0.21 ± 0.04°C and a mean global surface ozone reduction of 1.0 ± 0.2 parts per billion. Our results demonstrate the effectiveness of methane removal in delaying warming thresholds and reducing peak temperatures, and also allow for direct comparisons between the impacts of methane and carbon dioxide removal that could guide future research and climate policy."

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27.09.2021

# Media

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Taz.de: party programs for the climate. 1,5 degrees? No plan! (German)

German article on party programs for tackling climate change.

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27.09.2021

# Media

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S&P Global: Moniz wants to turn more focus to clean alternative fuels, negative emissions

"Full electrification of the economy is simply not an attainable goal, former US Energy Secretary Ernest Moniz said at an industry forum Sept. 15, as he advised policymakers and the private sector to turn more attention to low-to-no-carbon fuels and carbon-negative technologies."

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27.09.2021

# Media

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Podcast: Climate 201: Negative Emissions III: Technological Promises, or Prevarications

"In this episode, we discuss whether the promises that some new technology - like negative emissions - will come along and "solve climate change" for us are genuine, or if they have instead shaped climate policy into prevarication and procrastination."

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27.09.2021

# New Publications

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Melnikova, Irina; et al. (2021): Impact of bioenergy crops expansion on climate-carbon cycle feedbacks in overshoot scenarios

Melnikova, Irina; Boucher, Olivier; Cadule, Patricia; Tanaka, Katsumasa; Gasser, Thomas; Hajima, Tomohiro et al. (2021): Impact of bioenergy crops expansion on climate-carbon cycle feedbacks in overshoot scenarios. In Earth Syst. Dynam. Discuss. (preprint). DOI: 10.5194/esd-2021-72.

"Stringent mitigation pathways frame the deployment of second-generation bioenergy crops combined with Carbon Capture and Storage (CCS) to generate negative CO2 emissions. This Bioenergy with CCS (BECCS) technology facilitates the achievement of the long-term temperature goal of the Paris Agreement. Here, we use five state-of-the-art Earth System models (ESMs) to explore the consequences of large-scale BECCS deployment on the carbon cycle and carbon-climate feedback under the CMIP6 SSP5-3.4-OS overshoot scenario, keeping in mind that all these models use generic crop vegetation to simulate BECCS crops. We show that an extensive cropland expansion for BECCS causes ecosystem carbon loss that drives the acceleration of carbon turnover and affects the estimates of the absolute values of the global carbon-concentration β and carbon-climate γ feedback parameters."

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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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27.09.2021

# Political Papers

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UNEP (2021): The Net in Net Zero: The role of negative emissions in achieving climate alignment for asset owners

UNEP (2021): The Net in Net Zero: The role of negative emissions in achieving climate alignment for asset owners. Available online at https://www.unepfi.org/wordpress/wp-content/uploads/2021/09/AOA_Negative-Emissions.pdf.

"This Net-Zero Asset Owner Alliance position paper presents the basis for scaling carbon dioxide removal (CDR) solutions, including a mix of land-based carbon sinks, nature-based solutions and technological carbon removal approaches, which are essential for alignment to a 1.5°C pathway."

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27.09.2021

# Media

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Video: C2GDiscuss: From net-zero to net-negative: policy implications for Carbon Dioxide Removal (CDR)

"According to IPCC, large-scale Carbon Dioxide Removal (CDR) is required in all of its pathways to limit global warming to 1.5oC with limited or no overshoot. CDR methods vary and include the use of nature-based approaches, such as afforestation and enhancing wetlands, or engineering-based approaches to directly capture CO2. At scale, they all present potential benefits and risks of negative side-effects and pose significant governance challenges, and many governance gaps exist. Discussions around CDR governance, in particular on nature-based approaches to CDR as well as direct air carbon capture and storage, have recently gained growing interest in light of the wave of net-zero pledges by governments, companies and other actors over the last two years. However, important knowledge gaps persist around the role CDR could play in achieving net-negative emissions after net-zero to deliver the Paris Agreement’s goals. This C2GDiscuss will explore issues such as, what needs to be done now to have CDR functioning by the time we need it; how can the full potential of CDR be realized as a climate response whilst making sure that the co-benefits are maximized, and trade-offs minimized in relation to the Sustainable Development Goals (SDGs)."

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