"CALEXICO, CALIF. — As the relentless wind stirs up piles of dust and dirt and creates a gigantic funnel of haze in the vast, sweltering Imperial Valley, children like Marco Cisneros battle to breathe."

"Pacific Gas and Electric Co. suggested to managers before the San Bruno pipeline explosion that downgrading more than 2,300 natural-gas leaks - and potentially not fixing them - would save the company nearly $5 million, according to an internal document obtained by The Chronicle."

"As the climate has warmed during the past several decades, there has been a growing imbalance between record daily high temperatures in the contiguous U.S. and record daily lows. A study published in 2009 found that rather than a 1-to-1 ratio, as would be expected if the climate were not warming, the ratio has been closer to 2-to-1 in favor of warm temperature records during the past decade (2000-2009). This finding cannot be explained by natural climate variability alone, the study found, and is instead consistent with global warming."

"Despite being orchestrated by musician Ryuichi Sakamoto, novelist Kenzaburo Oe and other prominent figures, the Sayonara Nukes 100,000 Rally held on the July 16 national holiday in Tokyo often looked and felt like conventional old-left demonstrations.

The rally to demand a nuclear-free Japan drew a large number of labor union members, consumer and other old-time activists, waving flags of their organizations, among the estimated 170,000 participants in Yoyogi Park in Tokyo's Shibuya Ward.

"WASHINGTON — Ten consumer groups that helped promote a landmark food safety law passed in 2010 say the Obama administration is holding up the rules that would put it into effect, a delay they say could cost money and lives this summer, the peak season for food contamination outbreaks."

"WASHINGTON — Federal health officials faced pressure from Capitol Hill and outside groups on Monday to investigate a wide-ranging surveillance program that the Food and Drug Administration mounted against a group of its scientists who raised warnings about the safety of medical imaging devices."

"WASHINGTON -- The U.S. Environmental Protection Agency won't adopt a proposed rule that would have required large livestock farms to report information about their operations."

"More than 50 percent of the United States is under drought conditions right now, putting 2012 in the same category with some of the worst droughts in the nation's history."

"Apple Inc rejoined the EPEAT environmental ratings system on Friday, acknowledging that its decision to stop participating in a program that rates the green credentials of electronic products was a mistake."

"There’s a term biologists and economists use these days -- ecosystem services -- which refers to the many ways nature supports the human endeavor. Forests filter the water we drink, for example, and birds and bees pollinate crops, both of which have substantial economic as well as biological value."