Anyone can paint such a scenario. That's no challenge. The challenge is to present one which is plausible.

It's not plausible that we'll burn as much oil as we possibly can, yet have restraint with the coal, and regrow the forests. It's like imagining that a burglar will take your DVD player but not the cash sitting next to it. Either he refrains from theft, or he gets right into it.

Had H&K described a scenario in which all fossil fuel use was restrained, my response would be, "that's nice - how?" But they didn't do that, they presented a confused and implausible scenario.

The senarios in that paper are a little dated now. You might be interested in the action plan outlined in this talk given in February in Bloomington, IL. http://www.columbia.edu/~jeh1/2008/illwesleyan_20080219.pdf
In the same directory you can find the draft paper I was responding to with the coral post at the Real Energy Blog.

Chris