Came across the No Impact Project which was inspired by "No Impact Man" - the New York journalist who decided to reduce his consumption to zero for an entire year (and dragged his family into it, too.) http://noimpactproject.org/experiment/ The good folks at the No Impact Project have created a week-long classroom project for grades 6-12, though they say it can be easily adapted for younger or older kids. There are five lessons - one for each day - that address ways to re-think our habits around consumption, energy, food, transportation and water. Looks like an interesting experiment! I'm going to sign up. Would love to hear from anyone else who's done it before, or is interested in doing it now.