The paper linked below has detailed costings for various methods of injection. It's been out for a while, but I'm not sure it's received full attention. These estimates conflict with those in the Aurora report, which has perhaps received more attention.
http://www2.eng.cam.ac.uk/~hemh/SPICE/papers/PhilTransRoySoc_LiftingOptions_Davidson_Burgoyne_Hunt_Causier.pdf -- 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.
