I suppose that as good as this sounds, and I have heard about it many times [1][2][3], it boils down to opportunity cost. To me it will allow for a powerful counter argument when it comes to hitting emissions targets.

[1] http://www2.eng.cam.ac.uk/~hemh/climate/Geoengineering_RoySo... [2] http://aircrap.org/uk-climate-fix-technical-test-put-on-hold... [3] http://www.bbc.co.uk/news/science-environment-14936184