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Engineered weathering process could mitigate global warming
Date:11/7/2007

CAMBRIDGE, Mass., Nov. 7, 2007 -- Researchers at Harvard University and Pennsylvania State University have invented a technology, inspired by nature, to reduce the accumulation of atmospheric carbon dioxide (CO2) caused by human emissions.

By electrochemically removing hydrochloric acid from the ocean and then neutralizing the acid by reaction with silicate (volcanic) rocks, the researchers say they can accelerate natural chemical weathering, permanently transferring CO2 from the atmosphere to the ocean. Unlike other ocean sequestration processes, the new technology does not further acidify the ocean and may be beneficial to coral reefs.

The innovative approach to tackling climate change is reported in the Nov. 7 issue of the journal Environmental Science and Technology by Kurt Zenz House, a Ph.D. candidate in Harvard's Department of Earth and Planetary Sciences; Christopher H. House, associate professor of geosciences at Pennsylvania State University; Daniel P. Schrag, professor of earth and planetary sciences in Harvard's Faculty of Arts and Sciences, professor of environmental science and engineering in Harvard's School of Engineering and Applied Sciences, and director of the Harvard University Center for the Environment; and Michael J. Aziz, Gordon McKay Professor of Materials Science in Harvard's School of Engineering and Applied Sciences.

"The technology involves selectively removing acid from the ocean in a way that might enable us to turn back the clock on global warming -- removing CO2 directly from the atmosphere while simultaneously limiting the rate at which man-made CO2 emissions are acidifying the ocean," Kurt Zenz House says. "Essentially, our technology dramatically accelerates a cleaning process that Nature herself uses for greenhouse gas accumulation."

In natural silicate weathering, atmospheric carbon dioxide dissolves into fresh water, forming a weak carbonic a
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Contact: Steve Bradt
steve_bradt@harvard.edu
617-496-8070
Harvard University
Source:Eurekalert

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