More comments: From: [email protected] [mailto:[email protected]] On Behalf Of Gregory Benford Sent: Friday, September 10, 2010 7:26 PM To: [email protected] Cc: [email protected]; geoengineering Subject: Re: [clim] Re: [geo] Carbon sequestration workshop Sep 9-10, Heinz Center, Washington DC
Andrew: Quick answers: 1. Burning crop waste doesn't pencil out. It burns at low temperatures, is mostly cellulose and lignin. That's why farmers don't sell it to biofuel burners. But it has plenty of carbon and few nutrients. [David Keith] if it was that simple, why are there so many successful examples of biomass cofiring? What about Gasfication as at Buggenum commercial scale? If there is an error in the stuff we, and hundreds of others have writen about how biomass cofiring works, please point it out with some technical detail. Simple assertions that "it burns at low temperatures" are not generally true. They are sometimes true. 2. There are no useful air capture technologies, and not likely to be any soon. The APS report about to appear spells out why: it's a huge energy sink. [David Keith] As it happens, the APS report has energy use figures that are very similar to those we and others have previously published. The argument is about capital cost. -- You received this message because you are subscribed to the Google Groups "geoengineering" group. To post to this group, send email to [email protected]. To unsubscribe from this group, send email to [email protected]. For more options, visit this group at http://groups.google.com/group/geoengineering?hl=en.
