"The nation’s top pipeline regulator has taken too long to impose congressionally ordered safeguards, including changes that could have blunted the impact of a recent spill in California, lawmakers said Tuesday."

"Kyle Tisdel and Samantha Ruscavage-Barz sift through rocks beside a dusty road in New Mexico's high desert, searching for remnants of life a thousand years past. With the nearest meager town of Cuba an hour away, they're off the beaten path by any standard. But to them, these dirt roads surrounding Chaco Canyon are the front lines of a monumental battle pitting ancient Pueblo culture against the modern world's thirst for oil."

"The nuclear agreement with Iran opens the way for a flood of new oil eventually to pour onto world markets, setting up a potential windfall for energy giants. But it will take a year or more before Iran can increase production significantly, delaying any impact on oil prices."

"Environmental groups on Tuesday urged the U.S. government not to grant Royal Dutch Shell final permits for Arctic oil exploration after an icebreaker with safety equipment to cap wells was put out of action."

"Natural gas overtook coal as the top source of United States electric power generation for the first time ever this spring, a milestone that has been in the making for years as the price of gas slides and new regulations make coal riskier for power generators."

"Three of the candidates in the 2016 presidential race have pledged to shun campaign contributions from the fossil fuel industry."

"Lawmakers are set to grill the nation's top pipeline regulator on Tuesday, as a Houston company works to clean up oil spills in California and Illinois that have highlighted safety concerns."

"VIENNA — Iran and a group of six nations led by the United States have agreed to a historic accord to significantly limit Tehran’s nuclear ability for more than a decade in return for lifting international oil and financial sanctions against Iran, a senior Western diplomat involved in the negotiations said on Tuesday."

"More than half of the wastewater from fracked oil wells in California is disposed of in open, unlined pits and could contaminate groundwater, according to a state-mandated study of hydraulic fracturing issued Thursday."

"Oil extended its decline after its biggest weekly drop since March as investors weighed the prospects of Iran increasing crude exports in an oversupplied market."