Re: "Instead of punching hippies..."
We've been about 5 years away from irreversible catastrophe for my whole life, apparently. When I was a teenager this sh*t scared me; I mean, the argument sounded convincing at the time, and there was the illusion of evidence. 30 years later and I'm still waiting for the sky to fall in. Reckon I'm still scared?
These damn hippies any more? They deserve rather more than the metaphorical punching you accuse Lewis of giving them.
Life (and the maximum post length allowed here, whatever that is) is too short to catalogue the absurdities in full, but someone mentioned "peak oil": this has been predicted for nigh on 90 years now... you *did* get the point of the story of the boy who cried "Wolf!", didn't you..?
To paraphrase Dawkins: "good people do good things, and evil people do evil things, but to get good people to do evil things, you need the Green Movement".