One of the often cited dangers of geoengineering is the potential for military use or other nefarious purposes.
Libro: Arming Mother Nature, (“Armando [Militarmente] a la Madre Naturaleza) Jacob Darwin Hamblin
EL USO DEL MEDIOAMBIENTE COMO ARMA - Traducción
March 2006 By Jamais Casio - Open the Future
One sign that this is underway is the announcement that DARPA -- the Defense Advanced Research Projects Agency -- is hosting a colloquium on geoengineering at Stanford this week. Ken Caldeira will be there, of course, and I would be shocked if David Victor wasn't also invited. DARPA is a weird agency that is ostensibly under the Pentagon, but has historically supported a number of projects without clear military applications. Still, the very fact that a Department of Defense agency is looking at geoengineering is raising hackles, even among attendees.
“The last thing we need is to have DARPA developing climate-intervention technology,” says Caldeira. He says he agreed to go to the meeting “to try to get DARPA not to develop geoengineering techniques. Geoengineering is already so fraught with social, geopolitical, economic, and ethical issues; why would we want to add military dimensions?”
Unfortunately, we don't need to "add" military dimensions -- they've been there from the beginning. A technology with the potential to alter critical aspects of the global environment, with differential effects across regions, and not dependent upon a massive industrial base (so even available to non-state actors)? As I said in 2007, only partially tongue-in-cheek, no state wants to find itself facing a "terraforming gap." Wise or not, smart or not, geoengineering is a geopolitical issue, with all that entails.