"A wildfire burning out of control in mountains and foothills east of Los Angeles mushroomed more than 50 percent overnight, forcing authorities to order three school districts to cancel classes due to heavy smoke and dangerous conditions."

"Nearly six years after a defective natural gas pipeline exploded in San Bruno, killing eight people and destroying 38 homes, a federal court jury convicted Pacific Gas and Electric Co. on Tuesday of obstructing the federal probe of the blast and of violating pipeline safety laws both before and after the disaster."

"The world’s longest-studied wolf pack may have been wiped out, wildlife officials fear amid an escalating battle between federal and state authorities in Alaska over the aggressive hunting of predators such as wolves and bears."

"When a pipeline break in North Dakota spilled salty, toxic drilling wastewater into a tributary of the Missouri River last year, it was national news. But it was only one of more than 640 oil and gas spills that affected groundwater or surface water in some way in 2015, according to a review of state and federal records by EnergyWire. Such spills can contaminate water with oil, salt, metals and even radiation."