The barriers that renewables and efficiency face come less from our living in a capitalist market economy and more from not taking market economics seriously.

Rely on renewable energy flows that are always there whether we use them or not, such as, sun, wind and vegetation: on energy income, not depletable energy capital.

Many analysts now regard modest, zero, or negative growth in our rate of energy use as a realistic long-term goal.

I once met an economist who believed that everything was fungible for money, so I suggested he enclose himself in a large bell-jar with as much money as he wanted and see how long he lasted.

I think along the way, as we treat nature as model and mentor, and not as a nuisance to be evaded or manipulated, we will certainly acquire much more reverence for life than we seem to be showing right now.

Our energy future is choice, not fate. Oil dependence is a problem we need no longer have-and it's cheaper not to. U.S. oil dependence can be eliminated by proven and attractive technologies that create wealth, enhance choice, and strengthen common security.

Economies are supposed to serve human ends.. not the other way round. We forget at our peril that markets make a good servant, a bad master and a worse religion.