Geologic carbon capture and sequestration encompasses approaches for relatively permanent storage of carbon in the Earth's geologic formations. Carbon dioxide (CO2) that has been captured from flue gas or other waste streams as pressurized fluids can be trapped geologically through thermodynamically favorable reactions between CO2 and silicate rocks to create stable mineral carbonates. This mineralized carbon is stored permanently in silicate-bearing rocks. CO2 can also be captured as dissolved or supercritical CO2 and stored in the subsurface pore space of sedimentary rock, trapped under impermeable layers. The Committee on Developing a Research Agenda for Carbon Dioxide Removal and Sequestration convened a webinar on November 15 and a workshop on November 28, 2017, in Palo Alto, California, to discuss carbon mineralization and subsurface storage approaches. Included in these discussions were presentations by speakers on the state of science and deployment, research and monitoring needs, potential risks, and costs of geologic capture and storage. This Proceedings of a Workshop-in Brief summarizes the presentations from both the webinar and workshop.
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