"Moving quickly to stem a controversy, President Barack Obama on Thursday nominated an expert on nuclear waste to lead the federal agency that regulates the nation's nuclear power plants."

"HOUSTON -- As the Memorial Day weekend and the summer driving season approach, gasoline prices are easing. But most drivers will find prices only modestly lower than a year ago."

"The ultra-conservative Heartland Institute admitted it was in financial crisis on Wednesday, with the flight of corporate donors making it difficult to pay staff or cover the costs of its annual conference aimed at debunking climate science."

"CHARLOTTE, N.C. -- The departing head of the U.S. Nuclear Regulatory Commission o n W ednesday continued to press for heightened safety regulations, at a meeting of industry officials who have often chafed at his push for new rules."

"COLUMBUS, Ohio -- Doctors given new access to the proprietary chemical recipes that oil and gas drillers use to crack into Ohio shale would be prohibited from sharing the information with the public under an energy proposal moving through the Ohio House."

"The Bitterroot Salish, Kootenai and Pen d'Oreilles tribes consider Montana's National Bison Range part of their heritage, a link to the animals their ancestors once hunted and worshipped."

"WASHINGTON -- Moms, a few dads and some children gathered at the Capitol on Tuesday to urge Congress to strengthen the federal government's powers to regulate harmful chemicals."

"WASHINGTON, DC -- The National Association for Stock Car Auto Racing (NASCAR) signed an agreement with the U.S. Environmental Protection Agency on Monday to raise awareness of environmentally-friendly products and solutions."

"The Energy Department is considering the purchase of experimental centrifuges from the United States Enrichment Corp as a way of channeling money to the ailing nuclear fuel company, which says it needs an infusion of cash by the end of the month."

"The leaders of nearly two dozen environmental groups called on President Obama to attend next month’s Rio+20 Earth Summit in Rio de Janeiro, underscoring the uncertainty that continues to cloud the historic meeting."