In asking my question, I was not implying that 2 degrees was the best goal; only looking for a cite that current CO2 concentrations are incompatible with 2 degrees. I read Meinshausen, et al to say that current CO2 concentrations are not incompatible with 2 degrees. Of course, this is somewhat academic because we are not on a course to stabilize at current CO2 concentrations.
Sent from my iPad On Mar 16, 2014, at 10:36 AM, "Ronal W. Larson" <[email protected]<mailto:[email protected]>> wrote: David, list, et al Re your "...what papers...." question below, I suggest that for me the most powerful are the many from Jim Hansen - clearly saying that even 350 ppm is probably not enough. He has mentioned in his papers both biochar and afforestation in the CDR area. I presume you are familiar with his position on the need for CDR, but can give more specific citations. I seriously doubt the NRDC is going to disagree with Hansen on the urgent need for 350 or better - are you? I think that the FOE position is more positive than John Nissen has described - and will comment on that next. I don't think it pertinent, because the subject was the Keystone pipeline, but Hansen gave powerful testimony on the need for carbon reductions before a Senate Foreign Affairs Subcommittee a few days ago. See http://www.c-span.org/video/?318285-1/hearing-keystone-oil-pipeline. Ron On Mar 16, 2014, at 7:19 AM, Hawkins, Dave <[email protected]<mailto:[email protected]>> wrote: John, You say-- the level of CO2 in the atmosphere has to be reduced if the world is to have any chance of keeping below 2 degrees C warming. If you are referring to today's level of CO2 in the atmosphere, what paper(s) can you point to that support this conclusion? As for the FOE comments about geoengineering, I think it is worth noting that FOE says it opposes only one form of geoengineering, SRM, and appears to be primarily concerned about one form of SRM, stratospheric particle injection. David Sent from my iPad On Mar 16, 2014, at 4:50 AM, "John Nissen" <[email protected]<mailto:[email protected]><mailto:[email protected]>> wrote: Hi all, FoE says the WG2 report on climate impacts will be published on March 29th and the WG3 report on "pathways to avoid dangerous climate change" will be published on April 11th. <snipped> -- You received this message because you are subscribed to the Google Groups "geoengineering" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To post to this group, send email to [email protected]. Visit this group at http://groups.google.com/group/geoengineering. For more options, visit https://groups.google.com/d/optout.
