"BISMARCK, N.D. -- One year after a pipeline rupture flooded a wheat field in northwestern North Dakota with more than 20,000 barrels of crude, Tesoro Corp. is still working around the clock cleaning up the oil spill -- one of the largest to happen onshore in U.S. history."

"Temperatures below 20 degrees Fahrenheit froze the valve on the back of Greg Bish's frack truck. To thaw it, he fetched a blowtorch and put the 4-inch flame to the metal. The explosion blew him 75 feet, over a 7-foot-tall barbed-wire fence, and killed him."

"AUSTIN — Susan Combs, the state comptroller, stirred controversy last month when she said Texas’ growing wind energy industry should 'stand on its own two feet.'"

"TransCanada Corp.’s $11-billion Energy East pipeline project has run into another stumbling block in Quebec as public opposition mounts over a possible threat to the endangered beluga whales in the St. Lawrence River."

"Three widely cited state studies of air emissions at Marcellus Shale gas development sites in Pennsylvania omit measurements of key air toxics and calculate the health risks of just two of more than two dozen pollutants."

"A disabled Russian cargo ship was en route to port in British Columbia for repairs and the rescue operation was declared officially over Sunday. Now the debate begins."

"Chevron Corp. is spending millions of dollars on a Richmond, Calif., city council election in an attempt to 'buy' the council, Sen. Bernie Sanders (I-Vt.) said."

"Trucks hauling mounds of sand into the southern Minnesota town of Winona for delivery to drilling sites across the nation's shale regions are not spewing dangerous dust emissions into the air, preliminary data shows."

"While cyberattackers and defenders duel for advantage in ever-more-complex digital battlegrounds, a set of basic vulnerabilities affecting power grids, factories and pipelines has gone largely unaddressed."

"Natural gas has been touted as a vital stepping stone in the transition away from petroleum, but a new study suggests that without clear policy gas could divert investment in renewables."