"Unwilling to wait for Congress to act, the Obama administration announced on Wednesday that it was moving forward on new rules to regulate greenhouse gas emissions from hundreds of power plants and large industrial facilities."

"The Environmental Protection Agency detailed its plans on Tuesday for research into the possible health and environmental risks of nanomaterials, tiny substances that are finding growing use in products like sunscreens and industrial adhesives."

"This fall may prove to be a watershed moment for the parks," as a six-part PBS series by Ken Burns highlights their glories and their problems -- air pollution, a changing climate, and needed upkeep among them.

"An early version of Senate climate legislation obtained today by E&E confirms that Sens. Barbara Boxer (D-Calif.) and John Kerry (D-Mass.) largely plan to follow the path their Democratic colleagues pursued in the House-passed climate bill."

"With more and more toxic chemicals turning up in people's bodies and the environment, the Obama administration asked Congress Tuesday to draft a tougher law for how the government regulates tens of thousands of chemicals."

"More than 50 years after nearly being wiped out in eastern U.S. forests by a deadly imported fungus, the American chestnut may be on the comeback trail."

"Waterways across the upper Midwest are increasingly plagued with ugly, smelly and potentially deadly blue-green algae, bloomed by drought and fertilizer runoffs from farm fields, that's killed dozens of dogs and sickened many people."

"The US Environmental Protection Agency is recommending that owners of older buildings – including schools – test brittle, aging masonry and window caulking for high levels of likely cancer-causing chemicals."

"New research raises questions about the safety of eating wild game, and triggers a renewed debate about banning lead ammunition."

"Exelon, one of the country’s largest utilities, said Monday that it would quit the United States Chamber of Commerce because of that group’s stance on climate change."