What about the green-minded folks who aren't doing it to make themselves feel better, but to pitch in and help the world? Many of them are DIYers anyway, and don't buy "green products" other than things like barrels to catch rain, etc. And the hardcore ones may have bartered for the barrel, instead of playing the money game.

I'm thinking a little population control (okay a lot...) and ditching consumerism would go a long way toward the goal.

What were tribes doing 10 thousand years ago that was vastly unsustainable? That statement didn't make much sense to me...