When the planes still swoop down and aerial spray a field in order to kill a predator insect with pesticides, we are in the Dark Ages of commerce.

Green business is not about tie-dyed T-shirts. It's about transforming the industrial system itself into one that looks at all the connections.

And also, more and more businesses really want to do the right thing. They feel better about themselves, their workers feel better, and so do their customers. I think this is equally true in the transnational corporations, but it is harder to express in those situations.

Interestingly, the oil companies know very well that in less than 30 years they will not only be charging very high prices, but that they will be uncompetitive with renewables.

The most unrealistic person in the world is the cynic, not the dreamer.

Capitalism, as practiced, is a financially profitable, non-sustainable aberration in human development.

If, as is natural, you focus on the corruption and on those threatened institutions that are trying to prevent change - even though they don't really know what they're trying to prevent - then you can get pessimistic.