A legislative and regulatory battle over slaughter of wild horses is dividing conservation celebrities and American Indians in the Southwest and Mountain West.

"A 27-year-old U.S. program intended to warn the public of the presence of hazardous chemicals is flawed in many states due to scant oversight and lax reporting by plant owners, a Reuters examination finds."

"WASHINGTON — As part of the climate change agenda he unveiled this year, President Obama made a commitment to significantly reduce the federal government’s dependence on fossil fuels. The government, he said in a speech in June at Georgetown University, 'must lead by example.' But just two miles from the White House stands the Capitol Power Plant, the largest single source of carbon emissions in the nation’s capital and a concrete example of the government’s inability to green its own turf."

"A year ago, the Fish and Wildlife Service was poised to use a scientifically flawed range map for the American burying beetle during a preliminary assessment of the Keystone XL pipeline's effect on the endangered insect."

"The weather is one of those topics that is fairly easy for people to agree on. Climate, however, is something else. Most of the scientists who study the Earth say our climate is changing and humans are part of what's making that happen. But to a lot of nonscientists it's still murky. This week, two of the nation's most venerable scientific institutions tried to explain it better."

"California billionaire Thomas Steyer is taking his fight against climate change to Virginia, helping to buy TV ads criticizing Republican gubernatorial candidate Ken Cuccinelli."

"Developers of the proposed Pebble mine don't deserve special protections for buying insider documents about the financial workings of project opponents and then using the records to pursue a case against those opponents with the Alaska Public Offices Commission, a California appeals court panel ruled [July 30]."

"The Environmental Protection Agency is proposing to let oil companies continue to dump polluted wastewater on the Wind River Reservation in Wyoming. This includes chemicals that companies add to the wells during hydraulic fracturing, an engineering practice that makes wells produce more oil."

"NEW YORK -- All of the notices U.S. regulators received to vouch for the safety of common food additives between 1997 and 2012 were submitted by people who had a vested interest in the outcome of those assessments, according to a study published in JAMA Internal Medicine on Wednesday."

"BP Plc said Monday it has discovered new evidence of fraud and conflicts of interest in the program that is paying billions of dollars to businesses and residents who claimed they were harmed by the 2010 Gulf of Mexico oil spill."