"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."

"Drought and demand are pushing the Colorado River beyond its limits — with the needs of more than 40 million people in seven Western states projected to outstrip dwindling supply over the next 50 years, according to an advocacy group's report on endangered rivers released on Wednesday."

"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."

"Republican lawmakers on Tuesday worked on two fronts to advance legislation that would force approval of the Keystone XL pipeline."

"WASHINGTON -- The Obama administration’s nominee to lead the Environmental Protection Agency declined on Thursday to answer questions about a controversial new guide that suggests public health standards could be relaxed dramatically in the event of a nuclear attack or accident."

"President Obama's top energy adviser repeatedly huddled with oil and gas lobbyists in the months before the administration changed new hydraulic fracturing rules to the industry's liking, records show."

While honey bee die-offs often called "colony collapse disorder" have been increasing for several years, so has scientific evidence that a widely used class of pesticides called neonicotinoids could well be an important contributing cause. In 2011, EPA said it would review its approval on one such pesticide. Now it says it expects to finish in five years.

"You might have been wondering whether the Obama administration was going to impose the first-ever greenhouse gas limits on new power plants, since the deadline is April 13."

"Decades ago, when a U.S. EPA administrator was on the brink of retirement, employees wheeled a giant cardboard box into his office. Inside: an employee known for his tendency to disparage the agency's decisions in the press."

"SAN PEDRO, Calif. -- If there's a computer on your desk, a Sony television in your den or a pair of Nike sneakers on your feet, you're connected to Pier 400 at the Port of Los Angeles here."