"WASHINGTON — Gregory B. Jaczko, whose three-year tenure as chairman of the Nuclear Regulatory Commission has been marked by bitter battles with colleagues and with Congress, announced Monday that he would step down as soon as a successor was confirmed."

"With "Golden Holocaust," historian Robert Proctor deconstructs an industry that still kills more than 400,000 Americans a year."

"Environmentalists battling Canadian oil companies over the proposed Keystone XL pipeline to the Gulf Coast and another link west to Asia are now girding for what they see as industry's Plan C: Move heavy crude to the East.

At issue is a plan announced this week by Enbridge Pipelines Inc. to reverse the flow of a pipeline that now carries 240,000 daily barrels of imported oil west from Canada's East Coast.

"Free-market thinktank's conference opens in Chicago with president admitting defections are hurting group's finances."

Budget and management problems have wracked the National Children's Study, once the most ambitious effort to document the effects of many factors -- including environmental ones -- on children's health during the entire time they are growing up.

"Chicago commuters have all the fun. Two weeks ago, there was the Heartland Institute’s Unabomber billboard likening a belief in climate change to psychopathy. This week, those stuck in traffic missed out on one larger-than-life retort to the Heartland campaign but will get to view another."

"The international trade court has effectively outlawed the sale of dolphin-friendly canned tuna in American supermarkets, ruling such labels were unfair to Mexican fishermen."

"COLUMBUS, Ohio -- Ohio senators approved new regulations for horizontal shale drilling known as fracking on Tuesday in a bipartisan vote punctuated by a spoken rendition of 'The Beverly Hillbillies' theme song."

"When writer Florence Williams was nursing her second child, she read a research study about toxins found in human breast milk. She decided to test her own breast milk and shipped a sample to a lab in Germany. What came back surprised her. Trace amounts of pesticides, dioxin and a jet fuel ingredient — as well as high to average levels of flame retardants — were all found in her breast milk. How could something like this happen?"

"The number of children considered at risk of lead poisoning jumped by more than five-fold on Wednesday, as the U.S. Centers for Disease Control and Prevention lowered its threshold for the diagnosis. Children's health advocates applauded the decision, but also expressed concern that recent congressional budget cuts will drastically limit funds that could help affected kids and prevent further poisoning."