The military is increasingly worried about the national security threats posed by climate change. The million dollar question, then, is whether these concerns will persuade skeptical, and/or industry-purchased, legislators to get behind bills like Waxman-Markey.
The short answer is who knows. But there's an interesting parallel here, I think, with the early civil rights movement. It would be nice to think that most white leaders came around on civil rights because of the sheer injustice of segregation. In reality though, as people like Mary Dudziak have argued, civil rights became a Cold War issue. Indeed, one of the reasons the Court in Brown in 1954 was unanimous was because Justice Stanley Reed was more anti-Communist than pro-segregation.
In short, the Cold War gave many leaders political cover to support civil rights.
Maybe national security concerns can eventually do the same for today's legislators on climate change. The immorality of leaving future generations with an irreversibly overheating planet doesn't seem to be doing the trick.