A report by analysts at Citigroup says a shift from oil to natural gas that began in the United States is about to follow suit in other countries. The report says gas may supplant oil for generating electricity in the developing world and will also become more commonly used for transportation.
Building huge turbine farms too close together might significantly reduce their power, some atmospheric scientists say. The problem is "wind shadow" — the turbulence created by one big cluster of turbines that steals wind from another cluster down the road.
Creators of a solar-powered aircraft hope to fly it day and night across the U.S. with no fuel, and eventually around the world. It's a quixotic — some might call it nutty — undertaking. But the creators hope the flight helps challenge assumptions about what solar technology can do.
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