"Sustainability: living within our means in an ongoing manner. Matching supply and demand, with a big safety margin to get us through hard times. Developing renewable energy sources, improving efficiencies in energy and resource usage, and striving to cap the demand instead of just allowing it to forever increase, especially when there are obvious stresses on our ability to meet this demand. ie: stop population growth."

What tripe; the usual mixture of Scottish thrift homilies mixed with some Ehrlich Malthusian junk wrapped in the insidious misanthropy which informs sustainability.

The terms Ludwig uses are meaningless given that technology continually overcomes the limitations which 'nature' oppresses humanity with; after all perfect sustainability is living in a cave grunting at each other; or if you are a real green purist, having no humans at all.

As for population, what about colonising other planets; are you against that?

And please, renewables DO NOT work; any time I see someone advocating the new sustainable future on the back of renewables I think, here we go, another bubble-head with no connection with reality

Why is it cohenite that I detect you as being nothing more than protagonist for the sake of getting your thrills from an argument?

You and I both have very strong criticisms for the Greens, but rather than concentrate on that substantial common ground and approach our differences gently and tactfully, you have ignored the common ground entirely and taken a most unfriendly approach. Very poor form mate. And your comments on sustainability are so absurd!

Obviously you are not worth having any further correspondence with. Have a nice life.