energy

The idea of solar-powered headphones is certainly a worthy one, but we're not sure how well products like this will fare in hotter climes. The "Soltronix Headphone Radio" looks a little bulky for summertime wear and, as we've noted many times in this space, we're morally opposed to anything that might draw perspiration.

And as Ubergizmo notes, plastic tends to warp and crack if left in the sun too long. But if they do hold up, this $50 headset can get 19 hours of playback time on a four-hour charge.

Just remember, unless you've … Read more

The new Tesla Roadster is getting some buzz. Being built as an all-electric car, Tesla's engineering aims to minimize resource consumption per mile. CNET News.com reporter Stefanie Olsen watched a Tesla engineer answer questions from a roomful of Silicon Valley engineers. He said his Tesla will go 4,900 miles on 1 megawatt of energy while a hydrogen car would go about 1,800 miles because of the energy needed to produce the hydrogen.

The Tesla on display was the second engineering prototype. Last fall, CNET captured video of an earlier prototype.

Tesla has already sold 180 of … Read more

There are two major problems with the current silicon panel technology used to generate electricity. For one, silicon is inefficient in converting solar energy. The thinner the silicon panel, the less efficient it becomes. Secondly, silicon panels make up about 45 percent of the total cost of current solar power installations. So thinner panels requiring less silicon would cut down on installation costs.

Now researchers in Australia say they've found a way to make silicon films, 1 to 2 microns thick, into more efficient energy converters. The trick is to impregnate the silicon film surface with small amounts of … Read more

Man-made supercomputers are fast. Photosynthetic bacteria are just as fast.

Arizona State University researchers have learned that, during photosynthesis, bacteria may realign crucial proteins very quickly. This allows the bacteria to capture nearly every photon of available light. How quickly? A millionth of a millionth of a second, about the same time it takes for a supercomputer to carry out a single flop. To make measurements in such tiny time scales, the scientists used an ultrafast laser facility.

Moving those proteins around rapidly allows the bacteria to capture most of the potential energy in their biological circuitry. Thus, photosynthesis can … Read more

The world's youngest celebrity is building quite a media career. Five-month-old polar bear, Knut, is already a star at the Berlin Zoo. He also stars in more than two dozen YouTube videos, which have accumulated millions of plays. When you visit Knut's new personal Web site you'll see pictures and e-mails from adoring fans.

But today we learn that Knut and a human co-author have a book deal. One purpose of the book will be to draw attention to global warming, says the human writer. The book'll be published by Scholastic, which has a track record … Read more

Our CNET editors have pulled together useful information on green technologies. The emphasis is on things available to the consumer right now, and many can save you energy and money.

Our Living With Technology report has reviews of hybrid cars and energy-saving products for your home. Also there's a section on Earth-friendly downloads that can be useful. And editor Michael Kanellos produced a video to show some things you can do at home to save money on energy.

Nothing lasts forever, so we even have a guide on how get rid of tech gear when the time comes.

The convergence of plant and machine is upon us. The "EnergyTree" is an experimental contraption that links a computer's power levels to the health of a living thing.

It was the brainchild of U.K. product designer Ben Arent, who created the concept for Microsoft's "StartSomething" PC design competition this year. The goal, according to Yanko Design, is fairly simple: "If the user is extremely efficient with their energy use the EnergyTree will give the tree the nutrients and water it needs to survive and flourish. If the user is inefficient with their … Read more

A few minutes ago, I was crawling through the oft-dull posts that turn up in my RSS reader on Saturday mornings while downing the day's first cup of coffee. Not particularly momentous. Then I saw this TreeHugger post, and I was all wow, you know, in the way that Microsoft was hoping I'd react to Windows Vista. (I didn't, for the record.)

So what are these? They're called USBCell, and they're AA batteries that you charge in a USB port. What a cool idea! Of course, there's always the quality issue, but TreeHugger seems … Read more

The federal government now predicts a new cycle of solar storms will start in March 2008. Those storms are expected to peak around the end of 2011. That's the conclusion of some scientists at NOAA.

Solar storms lead to violent eruptions on the sun's surface. There'll be solar flares and explosions sending highly charged matter toward Earth's atmosphere. This jolts Earth's geomagnetic field and ionosphere. That can lead to disruption of electric grids and communications systems.

Sunspot predictions for this coming storm cycle run from 90 to 140. There were different prediction models among the … Read more