By the year 2000, such renewable energy sources could provide 40 percent of the global energy budget; by 2025, humanity could obtain 75 percent of it….

Whether you are buying a car or casting a ballot, choosing a job or planning a family, follow your moral compass. Don't let others define you. Don'….

We got everyone's attention, but we didn't solve any environmental problems..

When civilization stands at the edge of a cliff, a step forward doesn't make much sense..

We shouldn't fuel the future with the polluting methods of the past, ... We have the technology to power our future in ways that don't threaten our h….

Under communism, prices were not allowed to reflect economic reality. Under capitalism, prices don't reflect ecological reality. In the long run, the….

Earth Day gathered up those strands, and dozens more, and knitted them together in the public consciousness as "environmental" issues. The nation was….

Listen up, you couch potatoes: each recycled beer can saves enough electricity to run a television for three hours..

I feel more confident than ever that the power to save the planet rests with the individual consumer..

Environmentally, business in America in 1970 was very similar to business in China today. Even if a CEO wanted to be a responsible corporate citizen,….

That said, I'm embarrassed and furious that so many coal-state Democrats in the U.S. Senate are paralyzing international progress to protect the shor….

We presently have the technology ... fuel cells, solar cells, hydrogen ... the opportunities are amazing for clean energy..

It is already too late to avoid mass starvation..

Zeroes are important. A million seconds ago was last week. A billion seconds ago, Richard Nixon resigned the presidency. A trillion seconds ago was 3….

Our goal is to turn solar electric technologies into a commodity business like computer chips, and make them ubiquitous in the built environment. I'd….

Sustainability requires that we demand enduring quality. Steve Strong has a slide presentation pointing out that much of Oxford was built 800 years a….

These are not exhortations from overwrought extremists, but carefully phrased warnings from some of the world's finest scientists..

By 1975 - and continuing to today - all Americans came to believe that they had a "right" to a safe, clean, healthy environment. When I grew up, no o….

I suppose I'd characterize myself as having a faith-based optimism. My faith is parental and Darwinian..

Build high-speed, electrified trains over the most-traveled corridors. It'sreally hard to power carbon-free airplanes, but electrified trains are muc….

As a student of conservation biology, I believe that characteristics with survival value will ultimately prevail. There is no survival value in pessi….