"In the energy business, natural gas is supposed to be one of the good guys — the cleaner-burning fossil fuel that can help wean the world from dirty coal during the transition to a low-carbon future. But when natural gas escapes unburned, as it often does during production and distribution, it is a big troublemaker."

"Dirtier rivers or higher electric prices. That's what environmentalists and utility officials say is at stake in an upcoming federal court ruling in Virginia could have far-reaching effects on how energy companies dispose of coal ash waste left over from decades of burning coal. Spurred by high-profile coal ash spills and new federal regulations, utilities are grappling with the disposal of vast amounts of the heavy-metal-laced waste."

"GOLDEN, Colo. -- Two months ago, the Department of Energy trailered in a white, fish-shaped, 210-square-foot house and a dark jeeplike vehicle to put them on display here. The vehicle had an electric motor, a battery and a small gas-fired generator that could power the house, and the house had solar panels integrated into its rooftop that could power the car."

"An experimental solar-powered airplane has left Spain for Egypt in the penultimate leg of its globe-circling voyage."

"A new Wisconsin Department of Natural Resources draft report wrongly concludes that sand mining operations don't produce fine dust particles and shouldn't impact human health, an environmental advocacy group contends."

"The Obama administration on Thursday finalized rules that will require companies to have strict safety and environmental protection plans in place before they drill for oil or natural gas in the Arctic Ocean."

"Outside Susan Holmes' house in southeastern Oklahoma, visitors are welcomed by an entryway lined with oxygen bottles and a machine that collects and concentrates oxygen from the air."

"Canada’s pipeline watchdog has given two of North America’s largest energy companies up to six months to fix what industry insiders have described as a series of 'ticking time bombs.'"

"The U.S. electric power grid is one of the biggest, most costly machines on Earth."

"The Texas Commission on Environmental Quality approved expanding a wastewater permit for a South Texas coal mine over vocal opposition from locals Wednesday."