"A geoengineering nonprofit wants to spread silicate beads over polar sea ice to prevent the absorption of heat, but some scientists have their doubts."

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"Marine CDR techniques are for the most part theoretical, but if ever deployed, some could create large and potentially long-term risks and governance challenges. We do not yet know enough about the risks, costs and potential benefits, or governance requirements, to understand if marine CDR techniques could be viable, or – if so – whether, when or how to deploy them at scale."

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"In support of the UN Youth Climate Summit, the Carnegie Climate Governance Initiative (C2G) hosted a series of interactive games for young climate leaders exploring how society might tackle difficult decisions about whether or not to deploy climate-altering technologies to tackle global heating. Sessions were run by Red Cross Red Crescent Climate Centre and Climate Interactive at the offices of Carnegie Council for Ethics in International Affairs, New York City, September 22, 2019."

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"Nature-Based Solutions (NBS) to CDR include techniques such as large-scale planting of forests, replacing previously lost forests, and restoring wetlands. With the right policy, political and governance conditions in place, the United Nations Environment Programme (UNEP) estimate that forests, wetlands and soils could remove up to 4–12 GtCO2e per year, while some studies indicate a significantly higher potential."

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