Though born of idealism, the zero-waste philosophy is now propelled by sobering realities, like the growing difficulty of securing permits for new landfills and an awareness that organic decay in landfills releases methane that helps warm earth

If water were more expensive, would it be easier to conserve?

BOULDER, Colo. -- Matt Pierce has a day job. But at night and on the weekends, the 27-year-old is trying to make it as a farmer, cultivating 1,200 acres.

An engineer and retired Air Force colonel spent much of his military career creating coatings for spacecraft and airplanes, and has now invented a white "cool roof" coating that deflects 85% of the sun's heat and can cut air conditioning bills in half.

Building a more sustainable future is vital if our societies are to survive in a post-fossil-fuel future - but the way we build must itself first change.

The City of Toronto passed a bylaw on May 27 that makes green roofs mandatory on any all classes of new buildings.

The mineral is a key part of a Santa Monica firm's proposed alternative energy project in the desert. The technology was proved workable in a pilot project near Barstow in the 1990s.

Could you live without plastic? A reporter makes her family of four -- that on average buys or discards 200 plastic items a week -- go plastic free.

WASHINGTON - As more tribes explore and get involved in the renewable energy field, a network of tribal groups is asking President-elect Barack Obama to support tribally owned and operated renewable energy projects, along with economic development...

Famous for roles in films like The Shawshank Redemption and Million Dollar Baby, Freeman might not leap to the top of anyone's short list of celebrity eco-activists.