I buy the urgency as well. Thirty years may be a bit extreme, but certainly our effect on the planet is cumulative, maybe even exponential. It does concern me that we'll eventually reach a tipping point where it's just too late, even if everyone is on board with addressing it. In the early '80's I was being taught about cfc's already creating huge holes in the ozone layer. I don't believe climate change is something Al Gore invented, like the internet, but rather that it's been known for some time and is only being used as a political tool as of late. I will give Al Gore credit for that, however.