Have you ever seen the book Radical Simplicity? It is the most honest look at personal environmental ethics that I've seen.

The author's point is that your resource consumption load on the environment can be boiled down to how many children you have and how much money you spend. He figured that his fair share of the Earth's resources amounted to one child per lifetime and $6,000 of consumption per year. If you team up with a domestic partner and pool your resources then your household would consist of two adults, two children, and $24,000 of annual consumption. That also happens to be the federal poverty line.

I enjoyed reading the book even though the conclusion is sobering. He got his point across by setting his own goals for himself and showing the kind of world that he was trying to create through his personal action. He also acknowledged that others would choose different goals and would be willing to accept different outcomes. All he really asked his readers to do is take an honest look at what they were doing and what the consequences of their actions would be.