"As a matter of fact, of the 400 IPCC scenarios that keep warming below the Paris agreement target, 344 involve the deployment of negative emissions technologies, wrote Kevin Anderson in Nature Geoscience. But is carbon capture and sequestration ready for prime time? Will CCS technology work on a large scale? How expensive is it, how practical, and how soon can it be deployed?"

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"The electric vehicle of the future will be carbon negative (reducing the amount of atmospheric carbon dioxide) not just carbon neutral (not adding CO2 to the atmosphere), say researchers at Vanderbilt University and George Washington University (GWU). The trick: replace graphite electrodes in lithium-ion batteries (used in electric vehicles) with carbon nanotubes and carbon nanofibers recovered from carbon dioxide in the atmosphere. The new technology could also be used in sodium-ion batteries, currently under development for large-scale applications, such as the electric grid."

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"BECCS — raising, harvesting, and burning biomass for energy, while capturing and burying the carbon emissions — is unproven at scale. Thus far, most demonstration plants of any size attaching CCS to fossil fuel facilities have been over-budget disasters. What if we can’t rely on it? What if it never pans out?"

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Gabriel, Corey J.; Robock, Alan; Xia, Lili; Zambri, Brian (2016): The G4Foam Experiment. Global Climate Impacts of Regional Ocean Albedo Modification. In Atmos. Chem. Phys. Discuss., pp. 1–30. DOI 10.5194/acp-2016-849.

"Here we present the results of climate model simulations of a unique Geoengineering Model Intercomparison Project Testbed experiment to investigate the benefits and risks of a scheme that would brighten certain oceanic regions. The National Center for Atmospheric Research CESM-CAM4-CHEM global climate model was modified to simulate a scheme in which the albedo of the ocean surface is raised over the subtropical ocean gyres in the Southern Hemisphere. Like the commonly studied stratospheric geoengineering and marine cloud brightening proposals, this ocean albedo modification scheme is not currently possible. However, a stable, nondispersive foam, comprised of tiny, highly reflective microbubbles has been developed under idealized conditions, and, hence, a geoengineering scheme which simulates the effects of large-scale deployment of these microbubbles is appropriate to study at this time."

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