" An ample literature on SRM is already available (see especially refs. 14 and 15), in which numerous schemes of varying sophistication (such as placing mirrors in outer space, deploying reflecting aerosols or metal flakes in the atmosphere, manipulating cloud cover, enhancing land albedo, or simply painting roofs white) are explored.

Some of those ideas actually originated in the scientific circles surrounding John von Neumann and Edward Teller in the 1950s (16). These two masterminds openly advocated weather-manipulation ways of winning the Cold War against the Soviet Union. A contemporary giant of science, the Nobel laureate Paul Crutzen, has rekindled the SRM debate in 2006 through an essay on stratospheric sulfur injection (17). However, he has consistently argued then and ever since that such a climate-engineering scheme would be implemented out of despair only, that is, if the establishment of any “conventional” climate-protection measure (like a worldwide cap-and-trade system for greenhouse gas emissions) failed."
Geoengineering: The good, the MAD, and the sensible
Proc. Natl. Acad. Sci. USA 20 December 2011: 20277-20278.
http://www.pnas.org/content/108/51/20277.full