With fossil fuel prices escalating and countries searching for ways to reduce oil dependence and greenhouse gas emissions, capturing the earth's heat for power generation is garnering new attention. First begun in Larderello, Italy, in 1904, electricity generation using geothermal energy is now taking place in 24 countries, 5 of which use it to produce 15 percent or more of their total electricity. In the first half of 2008, total world installed geothermal power capacity passed 10,000 megawatts and now produces enough electricity to meet the needs of 60 million people, roughly the population of the United Kingdom. In 2010, capacity could increase to 13,500 megawatts across 46 countries-equivalent to 27 coal-fired power plants.

Finally someone in the mainstream media has seen fit to share with the public one of the basic facts necessary to understand the energy politics of the last two years: Senator McCain did not show up for the crucial vote [to extend the renewable tax credits] on July 30, and the renewable energy bill was defeated for the eighth time. In fact, John McCain has a perfect record on this renewable energy legislation. He has missed all eight votes over the last year -- which effectively counts as a no vote each time. Once, he was even in the Senate and wouldn't leave his office to vote. ... The fact that Congress has failed eight times to renew them is largely because of a hard core of Republican senators who either don't want to give Democrats such a victory in an election year or simply don't believe in renewable energy.

The world is finally doing something about climate change. People are changing their light bulbs and buying hybrid vehicles. Renewable energy is gaining ground. But is this enough? Policy-makers insist that environmental responsibility not come at the expense of economic growth. Massive populations in China and India are playing catch-up with America's consuming and polluting ways. And on a planet biologists believe can only support a few billion humans over the long haul, our population is near seven billion and continuing to rise. Will our efforts to save the planet be nullified by our worship of growth?

It is time to pay close attention to President Eisenhower's warning. In the past six months, the U.S. Air Force (USAF) has begun a major effort to define the future of energy supplies for the U.S. and for its military allies. If military brass reach their goal, the transportation fuel of the future will be based on coal. According to Air Force Assistant Secretary William Anderson, the USAF plan is to:

Getting a solar system installed on your house is decidedly complicated. There is no centralized system, only contractors who you may or may not be able to trust. Prices for installation vary wildly, as do prices for the modules themselves. But in California, where things are getting a bit more consolidated and simplified, one retailer is trying to make solar easy. And it's Wal-Mart. Or, Sam's Club in nine California stores: Corona, Murrieta, Glendora, Ontario, La Habra, Chino, Long Beach, Fountain Valley, and Torrance.

While still a small percentage of overall electric generation, there's no denying that wind power has been growing consistently in the United States. In 2007, an additional 5,329 megawatts of capacity was added, an amount which was slightly more than a quarter of all new global wind capacity that year. Currently an additional 8 gigawatts of wind capacity is under construction and scheduled to be operational by the end of 2008. The result: This will be the third straight year that the United States leads the world in annual wind power installations, according to a new study by Emerging Energy Research.

By changing the way that conventional silicon solar panels are made, Day4 Energy, a startup based in Burnaby, British Columbia, has found a way to cut the cost of solar power by 25 percent, says George Rubin, the company's president.

We may be driving on air in the next few years. That is, we may be driving vehicles powered by compressed air, instead of gasoline or diesel fuel. Researchers Yu-Ta Shen and Yean-Ren Hwang of the National Central University in Taiwan have developed an air-powered motorcycle, which uses the energy in compressed air, rather than gas, to drive the motor.

Algae could be used as a biofuel while simultaneously cleaning up the environment, report researchers at the University of Virginia. By feeding algae extra carbon dioxide - the principle greenhouse gas contributing to climate change - and organic material like sewage, environmental engineering professors Andres Clarens and Lisa Colosi believe they can boost algae oil yields to as much as 40 percent by weight, far in excess of what can be generated from soybeans.

A while back we reported (with some skepticism) a report coming out of China that said they would be producing over 100 gigawatts of wind by 2020, a 1,500% increase. Little did I know that the United States was, at the same time, on track to actually beat that! A report from Emerging Energy Research, a cleantech consulting firm, points out that the U.S. is now the world's fastest growing market for wind power. Last year 5 gigawatts of wind power were installed, and 2008 will break the record again with 8 new gigawatts under construction. The U.S. will shortly be the world's largest producer of wind energy, surpassing Germany's 22 gigawatts.

It's an uncomfortable thought: Human activity causing the extinction of thousands of species, and the only way to slow or prevent that phenomenon is to have smaller families and forego some of the conveniences of modern life, from eating beef to driving cars, according to Stanford University scientists Paul Ehrlich and Robert Pringle.

Hydrogen cars get no respect. A lot of people consider them the stuff of science fiction, a technology as vaporous as the stuff that drives them. But despite some hurdles even Liu Xiang couldn't clear -- creating a fueling infrastructure comes to mind -- Uncle Sam and the big automakers love hydrogen cars and are driving across the country in a fleet of them to prove they work. Even if they're occasionally hauled on trucks.

Jørgen Tranberg is a farmer who lives on the Danish island of Samsø. He is a beefy man with a mop of brown hair and an unpredictable sense of humor. When I arrived at his house, one gray morning this spring, he was sitting in his kitchen, smoking a cigarette and watching grainy images on a black-and-white TV.

After slow start, wave energy approaches commercial scales The burgeoning wave energy sector, which has endured ups and downs in recent years through initial testing of devices and uncertain government support, has recently set sail with new projects that have brought the industry to the brink of commercial development (Listen to podcast: Emergence of the wave energy industry).

This is a DOE report on Europe's community based model for developing wind energy.

Retailers are typically obsessed with what to put under their roofs, not on them. Yet the nation's biggest store chains are coming to see their immense, flat roofs as an untapped resource.

Researchers at the U.S. Department of Energy's Idaho National Laboratory say they have devised an inexpensive way to produce plastic sheets containing billions of nanoantennas that collect heat energy generated by the sun and other sources. They say this technology is the first step toward a solar energy collector that could be mass-produced on flexible materials.

The Arctic Hotel in Ilulissat, Greenland, is a charming little place on the West Coast, but no one would ever confuse it for a Four Seasons - maybe a One Seasons. But when my wife and I walked back to our room after dinner the other night and turned down our dim hallway, the hall light went on. It was triggered by an energy-saving motion detector. Our toilet even had two different flushing powers depending on - how do I say this delicately - what exactly you're flushing. A two-gear toilet! I've never found any of this at an American hotel. Oh, if only we could be as energy efficient as Greenland!

The University of Twente (UT) has devised a concrete capable of converting the nitrogen oxide from car exhaust--the source of smog and acid rain--into a nitrate, another chemical that will wash away in the rain.

Construction on the nation's first solar demonstration project in a highway right of way has begun. At the Interstate 5 and Interstate 205 interchange in Tualatin, Oregon, 594 solar panels are being installed on a strip of land beside the highway roughly the length of two football fields. Governor Ted Kulongoski, with transportation and utilities officials, broke ground on Thursday on the all-Oregon project.