Perspectives and challenges of marine carbon dioxide removal

Frontiers in Climate, Journal Year: 2025, Volume and Issue: 6

Published: Jan. 7, 2025

The Paris Agreement to limit global warming well below 2°C requires drastic reductions in greenhouse gas emissions and the balancing of any remaining by carbon dioxide removal (CDR). Due uncertainties about potential durability many land-based approaches deliver sufficient CDR, marine CDR options are receiving more interest. We present current state knowledge regarding potentials, risks, side effects as challenges associated with technical feasibility, governance, monitoring, reporting accounting covering a range biotic geochemical approaches. specifically discuss what extent comparison direct injection CO 2 into seawater, which had been proposed decades ago is now prohibited international agreements, may provide guidance for evaluating some

Language: Английский

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Novel Field Experiment on Alkalinity Enhancement in Intertidal Environments—A Trailblazer for Natural Climate Solutions

Journal of Geophysical Research Biogeosciences, Journal Year: 2025, Volume and Issue: 130(3)

Published: Feb. 27, 2025

Abstract One recently proposed approach to reduce atmospheric CO 2 concentrations is marine alkalinity enhancement. This technique increases the uptake capacity of seawater through weathering fine‐grained (mafic) rocks and minerals in environments. The process has been extensively tested laboratory studies verified by numerical models. Field experiments scaling under natural conditions are still lacking. In a methodological approach, novel situ experiment was designed installed salt marsh at Ria Formosa coastal lagoon, southern Portugal. comprised deployments different sizes olivine basalt substrates, control site, which were tidally submerged twice day. A monthly monitoring scheme supernatant porewater properties from each deployment site established, procedures for temperature, salinity, oxygen, pH, total alkalinity, nutrient, trace metal analyses defined. paper devoted methods describes design, protocol analyses, an evaluation experimental performance reliability. Data first 6 months presented validation experiment. They demonstrated elevated water samples, mostly after deployments, while pH reflect conditions. Significant differences observed between treatments background monitored during with strengths, limitations, recommendations upscaling as removal measure, servicing, subsequent investigations.

Language: Английский

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Mapping oceanic carbon potential

Nature Climate Change, Journal Year: 2024, Volume and Issue: unknown

Published: Nov. 8, 2024

Language: Английский

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