"TALLAHASSEE -- The state of Florida filed a lawsuit Saturday against the oil company BP and the cement contractor Halliburton over the Deepwater Horizon oil spill, becoming the fourth state to seek damages for the 2010 disaster."

"The U.S. Federal Energy Regulatory Commission proposed to revise its cybersecurity standards for the nation’s electric grid, expanding the rules to more than 60 additional companies."

"Power producers such as Dynegy Corp. and Duke Energy Corp. are bracing for new U.S. rules on the water they discharge, standards that may impose further costs on the embattled coal industry."

"A BP executive testified the captain of the oil rig that exploded and sent millions of barrels of oil pouring into the Gulf of Mexico delayed activating the installation’s safety systems after the blast as a trial over the disaster ended."

"Debra White Plume and Marie Brush Breaker Randall stood in the middle of Highway 44, alongside more than 70 other members of the Oglala Lakota Nation. For hours, they didn't budge -- much to the chagrin of some tractor-trailer drivers bound for the tar sands region of Alberta, Canada."

"LONDON -- The development of low-carbon energy is progressing too slowly to limit global warming, the International Energy Agency (IEA) said on Wednesday."

"Supreme Court justices [Tuesday] appeared receptive to the trucking industry's call to strike down a Port of Los Angeles program designed to clean up some of the country's most diesel-polluted air."

"The Obama administration on Monday renewed an interagency agreement that backs the development of biofuels for the aviation industry and reiterated its support for embattled federal renewable fuel targets."

"WASHINGTON, DC -- In a new report, 'Cooking the Books: How The State Department Analysis Ignores the True Climate Impact of the Keystone XL Pipeline,' environmental groups and scientists opposed to the pipeline warn of 'climate disaster' if President Barack Obama allows it to cross the Canada-U.S. border, carrying tar sands bitumen from Alberta to Nebraska."