Amateur architect Brad Pitt is getting keen on green design. Edward Norton is greening urbs and scoring solar power for low-income Los Angelenos. Leonardo DiCaprio's global-warming documentary is due any day now; until then, Al Gore's doc, An Inconvenient Truth, is sure to scare the bejeezus out of climate-change naysayers. And believers and heathen are coming together like the proverbial lions and lambs over environmental concerns. Even Wal-Mart is getting in on the act by buying some green power - well, for its Canadian branches, anyway.

Stewart Lee Udall served as Secretary of the Interior under Presidents Kennedy and Johnson, at a time of sea changes in the way the country thought about land and resource management, and when many of the nation's most important federal environmental laws were passed. James G. Watt served as Secretary of the Interior under President Reagan, during an era when federal control of anything was seen as bad. The two former Secretaries could not seem more different - and yet they sat down together last night in Boulder to discuss their careers, land management, the West, and the environment, and they even agreed on a thing or two.

Hosted by Danny Seo, this segment explain how to clean a garbage disposal in an eco-friendly way.

When it comes to bicycle cool, there's long been a trend in some urban areas—New York, San Francisco, and even here in Boulder - toward the scrungy messenger style chic: one pant-leg rolled up, ginormous shoulder-strap bags, bike chains worn as belts. The bikes themselves have been beat up and stripped down to the most minimal elements of cycling: the one-gear, no-brake fixie and its slightly more evolved sibling, the freewheeling, brake-enabled single-speed.

Meet 23-year-old Arkansas native Julia Butterfly Hill as she arrives in the Headwaters Forest of Northern California to join others who are already protesting against the aggressive logging practices of Pacific Lumber. When organizers look for somebody to “tree-sit” Luna for two weeks, Julia enthusiastically volunteers. But does she really understand what lies ahead?

Acclaimed chef Michel Nischan explains the ease of creating a garden in any environment.

Just what is this Earth Day thing, anyway? This Saturday marks the event's 36th anniversary, and with more people growing concerned about climate change, Earth Day 2006 is poised to be a big one. Earth Day celebrates the birth of the environmental movement - a day when people around the country came out to rally for cleaner air and water, conservation of land and wildlife, and more sustainable use of resources. The original Earth Day was bipartisan, and was followed by the passing of several of our most important federal environmental laws.

I hate myself for loving Target. While its mock-French nickname lost some cachet in the blogosphere once Katie Couric appropriated it, the big box bastion of home goods for the hipster still knows how to reel me in with all those stylish and whimsical items that I may or may not really need.

There's no way around it: Your car is contributing to global warming. In fact, it's almost certainly the single most environmentally harmful component of your lifestyle. The transportation sector is responsible for nearly 40 percent of nationwide greenhouse gas emissions, not to mention plenty of ozone-damaging and smog-forming pollutants. The good news is that new clean-car technologies are emerging at a rapid pace – not just behind the scenes, but in the showrooms of car dealerships near you. Efficient hybrid-engine cars like the Toyota Prius and the Ford Escape SUV can't keep up with demand. Meanwhile General Motors and Ford are ramping up their development of flexible-fuel vehicles that can burn both standard gasoline and biofuels such as ethanol. So if you're in the market for a climate-saving, planet-positive vehicle, which should you choose -- better mileage or biofuel?

Ice at the top and bottom of the planet - on Greenland and Antarctica - is melting faster than scientists previously thought, thanks to warming temperatures. This freshwater ice will pour into the ocean, causing sea levels to rise as much as three feet by the end of the century, and 20 feet or more after that. These are the alarming conclusions of a group of top climate researchers, including Dr. Bette Otto-Bliesner, a climate change scientist at the National Center for Atmospheric Research, in Boulder, Colo.