@Reyn,
The irony of these so called environmental activists, like the family featured in that documentary,
No Impact Man, and other allegedly adventurous families that temporarily remove themselves from "off the grid", is that they can afford to just take the time off from their work to dedicate their time to this all encompassing new lifestyle.
Driven by their own egos, they preach how people should do this form of conservation and people should stop doing that [name whatever the latest environmental fad here - the antitoilet paper fad for instance].
There are neighborhoods in New York City where they don't have any grocery stores, let alone grocers or farm stands that sell local produce. These are the poorest neighborhoods of the city.
True, there are some people who are following through with these conservation practices that are earnest and sincere in their beliefs rather then being conservationist just to appear to be hip to their friends and neighbors.
But generally, its all pie in the sky idealism that's out of reach of the average person.