"The leaders of nearly two dozen environmental groups called on President Obama to attend next month’s Rio+20 Earth Summit in Rio de Janeiro, underscoring the uncertainty that continues to cloud the historic meeting."

"The ultra-conservative group's climate conference showed how far it has fallen after an internet sting and a disastrous ad."

"It was an odd choice of icon for the ultra-conservative Heartland Institute. But there he was in round glasses, beard, and halo of curls staring out from T-shirts and coffee mugs at their gathering of climate change contrarians this week, the scientist whose internet sting set Heartland on its current course of collapse.

"In 2009 and 2010, the Delaware River near Wilmington got a little-noticed early taste of the waste left behind by the controversial natural gas drilling method called fracking. Some 1.4 million gallons of partially treated wastewater collected from hydraulic fracturing, or fracking, wells outside the Delaware River basin were further processed and flushed into Delaware waters through the commercial side of DuPont Co.’s big wastewater plant in Deepwater, N.J., near the foot of the Delaware Memorial Bridge."

"Like evolution, climate science has opened rifts in classrooms across the United States. Educators are lifting climate out of its narrow unit in middle school science – an effort, they hope, that will improve science literacy overall."

"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."