Walnut.. thanks so much for that link to the blog of Lierre Keith. I found her speaking about this issue on YouTube, and she is really so switched on and knowledgeable.

http://www.youtube.com/watch?v=rNON5iNf07o

I'm really interested in the environment and the ethical topics she raised, and I am delighted to have broadened my horizons by my exposure to her political awareness and experience.

Thanks again.