Hi Duncan, Thank you for your tremendous effort to describe all the available CDR/NET technologies together, in a comprehensive way such to allow a comparison.
I've been discussing biochar and rock crushing with Ron Larson and Oliver Tickell; we concluded that there was scope for a combined method, which could be scaled up to remove many gigatonnes of carbon per year at low cost. (We've used weight of carbon rather than CO2 in our calculations.) I think you should have a separate column for benefits, because biochar has several: it improves soil, reduces need for fertiliser (thus avoids considerable emissions), reduces water requirements, and is applicable in poorer countries for improved, productive and profitable farming. It is now recognised that ocean acidification could be far more serious and more urgent than hitherto suggested, such that we'd need CDR to get the atmospheric level of CO2 below 350 ppm within twenty or thirty years. For the first ten years, we'd have to build up CDR such as to cancel out global CO2 emissions. Then we'd have to ramp up CDR a bit further to actually reduce the CO2 level. I would like to see biochar take a significant role - but it would require education and infrastructure projects to mobilise farmers worldwide. Cheers, John -- On Wed, Sep 21, 2011 at 12:11 PM, Duncan McLaren <[email protected] > wrote: > Group members may find my assessment of negative emissions > technologies (NETs) of interest. > > The full report runs to about 100 pages, and can be found at > > https://sites.google.com/site/mclarenerc/research/negative-emissions-technologies > > A summary version written for Friends of the Earth (England, Wales and > NI) will be published online later today. > > The assessment covers a wide range of NETs, but not SRM techniques. It > considers capacity, cost, side effects, constraints, technical > readiness, accountability and more for about 30 options. > > I'd be delighted to get feedback and comments. > > regards > Duncan > > -- > 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. > > -- 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.
