National (U.S.)

"The Lyme-disease infection rate is growing. So is the battle over how to treat it."

"Sen. Joe Manchin (D-W.Va.) blasted President Obama's proposals to address climate change, saying new regulations on power plants would unfairly burden the coal industry."

"Yes, such a group exists. It thinks the world is flat -- but also getting warmer."

"President Obama set a high bar for approval of the controversial Keystone XL pipeline, declaring for the first time that he would let the project go forward only if it does not 'significantly increase' emissions of greenhouse gases."

"WASHINGTON -- President Obama, declaring that 'Americans across the country are already paying the price of inaction,' announced sweeping measures on Tuesday to reduce greenhouse gas pollution and prepare the nation for a future of rising temperatures."

"The solar plane will land in New York City soon, but its water-borne counterpart is already here: Early this week the world's largest solar-powered boat steamed into lower Manhattan and docked in small marina, usually reserved for multimillion dollar yachts, in the shadow of the new World Trade Center tower."

"WASHINGTON -- A Twitter photo and phone tip from a resident helped animal keepers track down a red panda in a Washington neighborhood after it went missing from the Smithsonian's National Zoo."

"For renewable energy supporters, this was supposed to be a year of statehouse setbacks."

"Natural gas has likely seeped into Northeast Pennsylvania water supplies from both deep gas drilling and natural processes, researchers at Duke University reported in a paper released Monday."

"In a win for the U.S. Environmental Protection Agency, the Supreme Court on Monday agreed to consider the legality of a controversial Obama administration effort to regulate air pollution that crosses state lines."