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At January's Detroit Auto Show, Mercedes-Benz eagerly showed off its hydrogen-powered F-Cell car, vowing to prove the viability of fuel-cell vehicles by driving three of them around the world. And now, 18,641 total miles later, it's completed that circumnavigation, arriving safely home at the company's Stuttgart headquarters. Does this prove fuel-cells are ready for prime time? Well, the trip took 70 driving days to cover four continents, and the vehicles' range topped out at just over 400 miles -- in Kazahkstan. But M-B admits there are only 200 refilling stations worldwide; in most cases the F-Cells had to rely on a tag-along mobile refueling unit. The company hopes its demonstration will spur development in a refilling-station infrastructure: having a fuel-cell car you can't easily refuel must feel like owning a flying DeLorean in 1885. Autoblog

Remember Beacon Power, that startup using 2,800-pound flywheels to cut noxious emissions? Well, three years later, the company is wrapping up construction of its first plant, a 20-megawatt operation that just happens to be the world's largest. The Stephentown, NY facility is home to 200 of these flywheels, which store and output energy as needed, essentially matching the power supply with the demands of the grid. The result, the company promises, is reduced energy waste and stable electrical frequencies hovering around 60Hz. And while the plant's already up and running at 18 megawatts, it won't be until later this month that Beacon finishes building it out so that it reaches its full capacity. Full PR and champagne-popping celebration plans after the break. Beacon Power's Stephentown, NY flywheel plant    CNET  

The best dishes always contain 30 per cent fat  minimum . This doesn't merely ensure a level of hearty satisfaction (Windows 7 Whopper anybody?), it also means the leftovers contain plenty of the greasy good stuff, which can be cleverly harvested and metamorphosed into biodiesel. The technology behind this process has been around for a while, but now British firm Greenergy claims it is ramping up commercial production. The firm's CEO reckons each of his new £50million ($80million) biodiesel plants will digest a sufficient volume of waste pies, fries and taramasalata to "fill out a cruise ship every year". Mmmm, pie. Greenergy International