George neglected a top taboo in sustainability discussions: overpopulation, He knows full well that to alienates most religions and rights/justice focussed people.
1. Be open-minded and be willing to alter your beliefs with new evidence.
2. Strive to understand what is most likely to be true, not to believe what you wish to be true.
3. The scientific method is the most reliable way of understanding the natural world.
4. Every person has the right to control over their body.
5. Gods are not necessary to be a good person or to live a full and meaningful life.
6. Be mindful of the consequences of all your actions and recognize that you must take responsibility for them.
7. Treat others as you would want them to treat you, and can reasonably expect them to want to be treated. Think about their perspective.
8. We have the responsibility to consider others, including future generations.
9. There is no one right way to live.
10. Leave the world a better place than you found it.
Science or not? 
George avoided the biggest taboo part of sustainability: overpopulation. He knows, but chickened out I suppose.
George neglected a top taboo in sustainability discussions: overpopulation, He knows full well that to alienates most religions and rights/justice focussed people.