Earth2tech has an article on how the military is using green tech these days. While that is nice and all, I would think that if the governments of the world were serious about the environmental crisis, the first thing they'd stop is war. From depleted uranium to landmines being found by kids some 60 odd years after a war, war is pretty tough on the land. On top of that clean technologies would be affordable if we weren't always in an arm's race. Can't we just play chess or have our leaders fight it out in the steel cage or something?
Well that's not going to happen, but you can read about the positive steps our military is taking over at earth2tech.