"A retired aerospace executive - appointed to review a study on hydraulic fracturing after it was disclosed the study's author has strong industry ties - has such ties himself."

"Trading pollution 'credits' to reduce the cost of cleaning up the Chesapeake Bay risks endangering the health of the region's poor and minority communities, a new report warns."

"Ever since comprehensive legislation to reduce greenhouse gases died in Congress two years ago, my colleague John Broder noted here recently, climate change has been the issue that national politicians seem to avoid at all costs. Supporting renewable energy? Fine. Advocating energy independence? Great. Calling for action on global warming? Not so much."

"The Canadian pipeline company TransCanada has quietly begun construction of the southern leg of the controversial Keystone XL pipeline, installing segments near Livingston, Texas, company officials confirmed Thursday."

"Facing criticism from federal and state lawmakers, the world's leading manufacturers of flame retardants say they are reviewing their advocacy efforts, including their involvement with an industry front group that waged a deceptive campaign to fuel demand for the chemicals."

"President Obama promotes wind energy in Iowa while Mitt Romney defends the coal industry before a group of miners in Ohio."

"President Barack Obama moved to stem the impact of the worst drought in 50 years as he directed the department of agriculture to buy up to $170m of pork, lamb, chicken and catfish."

"A federal investigation into two researchers who wrote a famous report on drowned polar bears is finally over, according to their lawyer. But the scientists still haven't been allowed to see a copy of the investigation report or its conclusions, says attorney Jeff Ruch of Public Employees for Environmental Responsibility."

"Noting the occasion of the 15th annual Lake Tahoe Summit, a conference examining the environmental and developmental issues affecting the iconic alpine region straddling the California and Nevada borders, California Governor Jerry Brown announced the launch of a website dedicated to combating skeptics of climate change.