"The U.S. Environmental Protection Agency has agreed to grant a petition by three nonprofit organizations to withdraw its approval for the potent greenhouse gas HFC-134a to be used in new automobile air conditioning systems."

The Nuclear Regulatory Commission currently requires nuclear plants to plan evacuation of a 10-mile circle in case of a radiation threat. But the government urged evacuation of a 50-mile circle after the disaster at Japan's Fukushima plant. Here's some information to help you calculate your own risk.

"An estimated 352,000 pounds of lead washed into Lake Coeur d'Alene on Jan. 18 after flooding related to a rain-on-snow event."

"A sleepy New Jersey town has popped onto people's radar screens because it has the oldest running nuclear power plant in the United States -- and, some say, the most dangerous."

"Japan’s effort to contain the crisis at the Fukushima Daiichi nuclear plant suffered a setback, an official said on Friday, citing evidence that the reactor vessel of the No. 3 unit may have been damaged."

Minnesota's Pollution Control Agency is trying to address the impact of dissolved chlorides in Twin Cities lakes -- road salt harming aquatic life. It may require changes in what it means to be a good neighbor in the snowy state.

"At the supermarket, most shoppers are oblivious to a battle raging within U.S. agriculture and the Obama administration’s role in it. Two thriving but opposing sectors — organics and genetically engineered crops — have been warring on the farm, in the courts and in Washington."

"Spawned by strangely cold temperatures, 'beautiful' clouds helped strip the Arctic atmosphere of most of its protective ozone this winter, new research shows."

Rock keyboardist and tree farmer Chuck Leavell is planting chestnut trees bred to withstand the blight that killed billions of American chestnuts since 1904.

"Charging up electric vehicles on the road is easier and more convenient now that Google has started adding charging station locations to the Google Maps platform."