Bomb the Ionosphere
So now weather is a national security concern? Actually, I see the point here: environmental change will surely wreak havoc on areas already operating at a sufficiently marginal level in many respects, not least being agriculture, obviously, and people unable to feed themselves are going to want to go elsewhere, not to mention that there will always be those who seize wield power in order to benefit themselves alone, which will require despotism and will create even more refugees. The "Fortress Europe" problem will be exacerbated and expanded considerably, putting the more industrially developed on the receiving end of many, many poor and desperate people. It will also make those nations more likely targets of the wrath of the underpriveleged. Too bad about the Kyoto Accords now; I hear those Blackhawk helicoptors don't work so well in harsh conditions.