The Solar-powered Solar Impulse 2 aircraft prepares to take off from the Cairo International Airport in the Egyptian capital on Sunday as it heads to Abu Dhabi on the final leg of its world tour. Khaled Desouki /AFP/Getty Images hide caption

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A car drives by a Switch data center in Las Vegas on Sept. 9, 2015. In 2013, data centers consumed 2 percent of all U.S. power — triple what they used in 2000. John Locher/AP hide caption

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Making The Cloud Green: Tech Firms Push For Renewable Energy Sources

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Consumer advocates took to the streets of Phoenix recently to protest against an Arizona utility's efforts to bill customers using a so-called "demand charge." If approved, Arizona Public Service would be the first utility in the country to place most of its residential customers on that kind of rate plan. Will Stone/KJZZ hide caption

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Uber But For Energy: Utility Surge Pricing Threatens Summer Cool

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A new study finds people who are well-hydrated have lower body weights and lower odds of obesity. Klaus Vedfelt/Getty Images hide caption

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Thirsty? New Study Links Good Hydration To Slimmer Waistlines

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Not In My Landfill: Georgia Residents Fight Plan To Store Toxic Coal Ash

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Logger Greg Hemmerich and his crew feed low-value trees into a wood chipper, before bringing the chips to ReEnergy Holdings' biomass plant in Lyonsdale, N.Y. David Sommerstein/NCPR hide caption

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Is Burning Trees Still Green? Some Experts Now Question Biomass

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'The New York Times' Investigates An Ailing Clean Coal Project

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Herman "Dub" Tolbert, shown inside an American Legion post in Bokoshe, Okla., says the community is left exposed and he's determined to make regulators listen. Joe Wertz/StateImpact Oklahoma hide caption

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Communities Uneasy As Utilities Look For Places To Store Coal Ash

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Eric Frumin (right) stands in front of his solar panels on the roof of his Brooklyn home alongside architect David Cunningham (left) and AeonSolar's Allen Frishman (center). Courtesy of Eric Frumin hide caption

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Solar Impulse 2, piloted by Swiss pilot Bertrand Piccard, prepares to land in Seville, Spain, on Thursday. Jean Revillard/AP hide caption

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'Beautiful Flight' Across The Atlantic Is Major Milestone For Solar Plane

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