An official advisory group to the Defense Advanced Research Projects Agency is convening an unclassified meeting next week to discuss geoengineering. Whether this will be helpful or hurtful for the prospects of geoengineering research remains unclear. Geoengineering is polarizing enough as it is without the military involvement. A key issue is whether DARPA is interested in pure research, or deployment.
Jamais Cascio has some insightful comments on this issue in his blog, Open the Future.