The challenge is either to build an economy that is sustainable or to stay with our unsustainable economy until it declines. It is not a goal that can be compromised. One way or another, the choice will be made by our generation, but it will affect life on earth for all generations to come.

The 20th century was the time when the world turned to use of fossil fuels and the 21st century will be the century of the renewables.

We are witnessing the beginning of one of the great tragedies of history. The United States, in a misguided effort to reduce its oil insecurity by converting grain into fuel for cars, is generating global food insecurity on a scale never seen before.

The foundation is being laid for the emergence of both wind and solar cells as cornerstones of the new energy economy.

In today's integrated world economy, ... eradicating poverty may contribute as much to U.S. security as eradicating terrorism.

In this era of tightening world food supplies, the ability to grow food is fast becoming a new form of geopolitical leverage, and countries are scrambling to secure their own parochial interests at the expense of the common good.

Socialism failed because it couldn't tell the economic truth. Capitalism may fail because it couldn't tell the ecological truth.