"A day after Canada issued stringent new rules for the transportation of oil by rail, federal regulators in the United States said on Thursday that they would push forward their own tank standards next week, potentially resolving a critical safety issue that has been mired in regulatory limbo for years."

"Florida Gov. Rick Scott and environmental advocates Wednesday called for federal officials to reconsider their delay of a $2 billion plan intended to help the Everglades and lessen coastal water pollution."

"The California Environmental Protection Agency has released a statewide list of census tracts most burdened by pollution, providing a first-of-its-kind ranking certain to pressure regulators to clean up neighborhoods with long-standing health risks."

"Baltimore has joined with other major U.S. cities in defending the federal government's authority to impose a 'pollution diet'  on the Chesapeake Bay."

"WEST, Texas -- Although the cause of the deadly blast at West Fertilizer Co. remains a mystery, a federal agency on Tuesday said the tragedy was preventable, citing shortcomings in existing regulations and standards at all levels of government."

"A few casual words and the early release of some scientific data have cost the San Antonio region much-needed state funds to battle its growing air pollution problem. The misstep, which appears to have been unintentional, highlights the sensitivity of studying oil and gas pollution in business-friendly Texas."

"Environmental groups are marking the 44th Earth Day on Tuesday with an assault on the Keystone XL pipeline, greenhouse gas emissions and other issues related to climate change."

Some Republicans in Congress publicly vote with their party to slash land and water conservation funds -- but then quietly ask for some of the money to be spent in their districts.

"The Obama administration finalized $6.5 billion worth of loan guarantees for the country's first U.S. reactors in decades without requiring developers to pay a "credit subsidy fee" -- money that protects taxpayers should the developers default, according to documents obtained by Greenwire."

"The Koch brothers and large utilities have allied to reverse state policies that favor renewable energy. Environmentalists are pushing back, but the fight is spreading and intensifying."