Interesting. I'll be digging through their work over the next few days.
I found one tidbit that sums up my green reason for riding:
It’s an economical internal combustion machine, embodying the contradiction between our love of engines and the recognition that our profligate use of them is destroying the planet.
Funny, because what do so many of us (including myself) do? Go out and burn through as many tanks of gas as we can just for the fun of riding. I figure my commutes to work offset the 1400+ miles I killed in the Rockies last week, or the 1600+ miles I killed in KY around Memorial Day, huh?