List: cc Greg and Keith 1. Note a piece (labeled #1/3) just sent that gives some background on this. Another backgrounder coming for some dialog after this (labeled #3/3). This is #2/3.
2. This message from a few hours ago from Greg might benefit from a little background. The site Greg gives (http://qz.com/154196) and quotes from is a blog piece (today) at a site called “Quartz” by a reporter named Eric Holthaus. I am pretty sure Greg had reacted favorably (talking about “revolution”). I reacted that way. An interesting article by Holthaus, who probably is expressing a view held by a majority on this list. 3. Below, in Greg’s excerpt, there is brief mention of Jim Hansen’s calling for faster action. There is a good bit more at the “qz” site. I wanted to emphasize this dialog because Hansen talks of CDR in terms of many hundreds of dollars per ton CO2 removed. He is ONLY talking about DAC (artificial trees). Greg and I are talking costs that are almost an order of magnitude lower. So, like Drs. Matthews and Solomon, Dr. Hansen has not helped the dialog on CDR with that view of costs. I am pretty sure that Greg agrees with Dr. Hansen on the need for thinking of a 1 degree C rise - not 2 degrees; I do. I presume many on this list do. 4. I hope we can have more dialog on costs and timing of all CDR approaches 5. My next note (#4/3) tries to close this loop with the partly side conversation with Keith Henson, which is shown in full below. Ron On Dec 20, 2013, at 10:28 AM, Greg Rau <[email protected]> wrote: Greg Rau To: Rongretlarson Larson, Keith Henson Cc: Geoengineering Reply-To: [email protected] Re: [geo] OPEN - Reversing climate warming by artificial atmospheric carbon-dioxide removal: can a Holocene-like climate be restored? - MacDougall - GRL - Wiley > While perhaps worthy of a new thread, I'll insert the following link as an > example of why CDR (and all other CO2 management methods) can't be ignored. > Obviously, we need a radical change in our energy systems, but lots of CO2 > emissions and very long term planetary damage will be done before these are > in place. Hence, very proactive CO2 management must be considered (a > revolution in thinking, spending, researching, evaluating and maybe > implementing; not necessarily along the lines advocated in this article) > > from http://qz.com/154196 > "And only last week, a conference of climate scientists in London explored > the theme of “radical emissions reduction” after noting that “nothing that > we’ve said or done to date about climate change has made any detectable dip > whatsoever”. Via a weblink, author Naomi Klein compared the fight against > climate change with the struggle against South African apartheid, and said, > “an agenda capable of delivering radical emissions reductions will only > advance if accompanied by a radical movement.” > + > Fed up with slow (or in some cases, backwards) progress on climate change, > environmental advocates are mulling desperate measures. Emerging at the head > of this pack is arguably the world’s most prominent climate scientist: James > Hansen, a former NASA researcher turned activist. > + > In a provocative study published earlier this month, Hansen and a group of > colleagues make the case for why radical action is needed. The now commonly > embraced international target of keeping global warming at a maximum of > 2°Cabove pre-industrial levels—a hard-won, but politically negotiated goal—is > actually much too high, Hansen says, and we should instead aim for 1°C. That > would be barely a blip higher than current levels of global warming (around > 0.8°C), but still the highest level ever experienced over the 10,000-year > course of human civilization. ”Our objective is to define what the science > indicates is needed, not to assess political feasibility,” the paper says." > more follows - see link > > From: Ronal W. Larson <[email protected]> > To: Keith Henson <[email protected]> > Cc: RAU greg <[email protected]> > Sent: Friday, December 20, 2013 8:20 AM > Subject: Re: [geo] OPEN - Reversing climate warming by artificial atmospheric > carbon-dioxide removal: can a Holocene-like climate be restored? - MacDougall > - GRL - Wiley > > Keith cc Greg > > I appreciate your enthusiasm for the solar satellite approach, but I have > my hands more than full with CDR (and specifically biochar). What was the > reason the Japanese dropped their program? > > > > Ron > > > On Dec 20, 2013, at 12:05 AM, Keith Henson <[email protected]> wrote: > >> Would you be interested in an engineering proposal to end the use of >> fossil fuels? >> >> Warning, it does so by substituting a cheaper energy source. >> >> Keith Henson >> >> On Thu, Dec 19, 2013 at 10:33 AM, Greg Rau <[email protected]> wrote: >>> Delayed response from me also. Just saw a brief review of this paper in my <snip Greg’s response that I just responded to, which also included mine on the MacDoougal article and Andrew’s introduction from October. Note message just above from Keith addressed only to Greg and myself. Response #3 coming next on that.> -- 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/groups/opt_out.
