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Direct Removal of Carbon Dioxide from Oceanwater (DOC)


Capture of dispersed greenhouse gases (GHGs) is an important part of a diversified portfolio of technologies to mitigate U.S. GHG emissions. A large portion of the 5.2 gigatons (Gt) of CO2 emitted each year in the United States is released in relatively small quantities from distributed sources (e.g., from small point sources or some transportation sources). For such emissions, point source capture may be infeasible. In those cases, capture of dispersed CO2 serves as a crosscutting and complementary approach to achieving economy-wide net-zero emissions. Beyond helping to achieve net-zero emissions, capture of dispersed CO2 can lead to net-negative emissions. Recent reports highlight the importance of negative emissions – at the Gt/y scale by midcentury – in limiting global temperature increases resulting from anthropogenic CO2 emissions. When coupled with storage or certain utilization pathways, capture of dispersed CO2 can meet such needs and offset historical emissions. For this Targeted Topic, ARPA-E is focused on the CO2 capture process; ARPA-E is not interested in proposals that focus solely on transport, storage, or utilization.
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