"From the sometimes bizarre front lines of the climate-change culture wars: It seems the brothers Koch, proprietors of the giant, Kansas-based industrial conglomerate and well-heeled supporters of Tea Party causes, have now set their sights on a group of anonymous pranksters who spoofed a Koch Industries press release last month — one that suggested the brothers were having a change of heart on climate change."

"U.S. EPA's air division has made headlines under President Obama for its push to limit greenhouse gases and toxic pollution, but the busy office is running late with new limits on asthma-inducing soot, close observers of the rulemaking process say."

"Brazil's environment agency approved on Wednesday the start-up of the Belo Monte power dam, a controversial $17 billion project in the Amazon that has drawn criticism from native Indians and conservationists."

"A North Atlantic current flowing into the Arctic Ocean is warmer than for at least 2,000 years in a sign that global warming is likely to bring ice-free seas around the North Pole in summers, a study showed."

"Do we worry now about the consequences of our carbon-intensive lifestyle, or do we let our children cope? The answer has a considerable impact when assessing the economic costs of a warmer planet."

"Most of the residents left, the school closed, the city government disbanded and starting this week, nearly every commercial building in Picher, Oklahoma, will be demolished."

"TIJUANA — A ruptured sewage pipe in Playas de Tijuana that led Baja California health authorities to close beaches—and raised concerns that the contamination also could affect ocean water quality north of the border—has been fixed, authorities said Thursday."

"A new study ranks West Virginia fourth in mercury pollution, a chemical closely tied to a number of health risks."

"The 'C-word,' climate, appears to have become to the Beltway what  the 'P-word,' population, has been in climate treaty negotiations for a long time — unmentionable."

"The cost of climate change impacts runs twice as high as previously estimated, according to revised data from a key economic model used by federal agencies."