Friday, June 30, 2006
Important--Carbon sequestration: less than meets the ear
A great deal of energy is being expended these days to see how close to "business as usual" we can remain and still deal with the climate change crisis. Ford's decision to abandon hybrids for "flex fuel" cars (i.e. defer reduced emissions another decade or so while ethanol 85 becomes available) and power companies eager embrace of geological carbon storage and sequestration are just a couple of examples. The latter has hit a bit of a bump in the road: a recent study by Kharaka suggests that CO2 increases pH and mobilizes toxic metals creating a potential for contamination of nearby aquifers. Geology study
Richard Kerr of Science reported:
Scientists testing the deep geologic disposal of the greenhouse gas carbon dioxide are finding that it's staying where they put it, but it's chewing up minerals. The reactions have produced a nasty mix of metals and organic substances in a layer of sandstone 1550 meters down, researchers report this week in Geology. At the same time, the CO2 is dissolving a surprising amount of the mineral that helps keep the gas where it's put. Nothing is leaking out so far, but the phenomenon will need a closer look before such carbon sequestration can help ameliorate the greenhouse problem, say the researchers.