Speaking of mineral carbonation, check out: http://onlinelibrary.wiley.com/doi/10.1111/j.1530-9290.2011.00368.x/abstract ;jsessionid=15DD453CB61D6B1B218D916F13507A2E.d01t01
-Greg On 9/23/11 4:40 AM, "Oliver Tickell" <oliver.tick...@kyoto2.org> wrote: > Monbiot's real mistake here is to swallow the conclusion of the Royal > Society report on the subject, whole and undigested, without critical > scrutiny or attention to other sources of information - in particular > as regards the weathering of magnesium silicate (not enough Ca > silicate to bother with): > > Monbiot reports: "Dumping lime or calcium or magnesium silicates into > the sea, where they react with carbon dioxide. Fairly safe. Effective. > Expensive. Has > the advantage of potentially reversing ocean acidification, but the > amount of quarrying required to produce enough ground-up rock is > likely to be prohibitive. " > > A) where does he get the idea that it's about dumping it in the sea? > It is about spreading the rock powder on land, and in intertidal > zones. > B) So it's "fairly safe". Why only "fairly"? This is just to > accelerate a natural process that is going on all the time anyway. > C) "Expensive" - how much? People who have done the sums > conservatively estimate $10-15 per tCO2. Making it one of the cheapest > options around. > D) It will only "potentially" reverse ocean acidification. Well, > insofar as the science of chemistry "potentially" applies. He seems to > be implying that maybe chemistry is "potentially" all wrong. George, > tell us more! > D) The amount of quarry is "likely to be prohibitive" - is it? Has he > done the sums? Has he asked anyone who has done the sums? Or is this > just his uniformed guess? For a start there are Gt of already mined > rock that can be used, in mine tailings around the world. From then > on, roughly 1t of rock sequesters 1t of CO2. So you need to mine an > amount of rock comparable to the amount of fossil fuel we are burning. > If it's not "prohibitive" to mine the coal, why's it "prohibitive" to > mine the rock? > > Oliver Tickell. -- You received this message because you are subscribed to the Google Groups "geoengineering" group. To post to this group, send email to geoengineering@googlegroups.com. To unsubscribe from this group, send email to geoengineering+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/geoengineering?hl=en.
