Olson, Robert L. (2011): Geoengineering for Decision Makers
Olson, Robert L. (2011): Geoengineering for Decision Makers. Science and Technology Innovation Program, Woodrow Wilson. Washington, D.C.
Report of the Woodrow Wilson Center for decision makers, with risk assessment, CE scenarios, and esp. the discussion of CE as an alternative to mitigation.
Also watch the video of the release event.