"The Obama administration has wound up its controversial investigation of a government polar bear researcher without finding any evidence of scientific wrongdoing, campaign groups said late Friday."

"Barry Commoner, a founder of modern ecology and one of its most provocative thinkers and mobilizers in making environmentalism a people’s political cause, died on Sunday in Manhattan. He was 95 and lived in Brooklyn Heights."

"In the aftermath of Memphis' smoggiest summer in years, local efforts to control air pollution have been thrown into disarray by the city's decision to withdraw funds for vehicle emissions testing and a Shelby County Commission squabble over plans for a new monitoring station."

"BINGHAMTON -- Broome County Executive Debbie Preston has been a consistent supporter of natural gas drilling in the Southern Tier, but challenger Tarik Abdelazim speaks passionately against hydrofracking until more studies are done."

"The Obama administration has wound up its controversial investigation of a government polar bear researcher without finding any evidence of scientific wrongdoing, campaign groups said late Friday."

"A handful of environmental groups are amplifying calls Thursday for President Obama and GOP presidential candidate Mitt Romney to speak up on climate change after a summer of devastating drought, fires, storms and heat."

The Army Corpts of Engineers changed the operating schedule for the Clearwater Dam on the Black River in Missouri in the 1990s in response to requests by Missouri farmers. On October 3 Arkansas is going to the U.S. Supreme Court arguing that the Corps action has damaged the 23,000-acre Black River Wildlife Management Area 115 miles downstream. What's more, the state is arguing that the Corps should compensate it under the "takings clause," a favorite conservative legal weapon.

"WINNSBORO, Texas -- Two anti-tar sands pipeline activists were arrested in east Texas on Tuesday as demonstrators continue a three-day-old tree-sit to block TransCanada’s Keystone XL pipeline."

Shannon Bebe of Dallas and Benjamin Franklin of Houston delayed pipeline construction for most of the day when they locked arms around construction machinery being used by TransCanada to build the southern branch of a pipeline from the Alberta tar sands to refineries on the Gulf Coast.

"SACRAMENTO -- Gov. Jerry Brown signed legislation Tuesday setting a two-year moratorium on closing state parks in the wake of a scandal in which some parks officials hid surplus funds while facilities were threatened with being shuttered."