It's a bit long but worth reading, if only to understand that the concept is being used out of context by some wanting business as usual.

http://permaculturetokyo.blogspot.com/

Thanks, I'm interested in all things "sustainable". I try to keep up on the latest info on sun- and wind-driven energy, micro eco-farms, the threat of GMO's. We try to raise more of our own backyard crops each year.