What I find interesting about this is that it had seemed to me that this community had largely moved on to CDR & especially BECCS as the preferred mechanism, most people accepting David Keith's view of SAI as a last-ditch option for slowing the rate of change. Do others agree with my formulation?
On Tue, Jul 5, 2016 at 10:06 AM, Andrew Lockley <andrew.lock...@gmail.com> wrote: > > > https://www.cia.gov/news-information/speeches-testimony/2016-speeches-testimony/director-brennan-speaks-at-the-council-on-foreign-relations.html > > Extract > > Another example is the array of technologies—often referred to > collectively as geoengineering—that potentially could help reverse the > warming effects of global climate change. One that has gained my personal > attention is stratospheric aerosol injection, or SAI, a method of seeding > the stratosphere with particles that can help reflect the sun’s heat, in > much the same way that volcanic eruptions do. > > An SAI program could limit global temperature increases, reducing some > risks associated with higher temperatures and providing the world economy > additional time to transition from fossil fuels. The process is also > relatively inexpensive—the National Research Council estimates that a fully > deployed SAI program would cost about $10 billion yearly. > > As promising as it may be, moving forward on SAI would raise a number of > challenges for our government and for the international community. On the > technical side, greenhouse gas emission reductions would still have to > accompany SAI to address other climate change effects, such as ocean > acidification, because SAI alone would not remove greenhouse gases from the > atmosphere. > > On the geopolitical side, the technology’s potential to alter weather > patterns and benefit certain regions at the expense of others could trigger > sharp opposition by some nations. Others might seize on SAI’s benefits and > back away from their commitment to carbon dioxide reductions. And, as with > other breakthrough technologies, global norms and standards are lacking to > guide the deployment and implementation of SAI. > > -- > 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 geoengineering+unsubscr...@googlegroups.com. > To post to this group, send email to geoengineering@googlegroups.com. > Visit this group at https://groups.google.com/group/geoengineering. > For more options, visit https://groups.google.com/d/optout. > ᐧ -- 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 geoengineering+unsubscr...@googlegroups.com. To post to this group, send email to geoengineering@googlegroups.com. Visit this group at https://groups.google.com/group/geoengineering. For more options, visit https://groups.google.com/d/optout.
