"The moderate global warming that has already occurred as a result of human emissions has quadrupled the frequency of certain heat extremes since the Industrial Revolution, scientists reported Monday, and they warned that a failure to bring greenhouse gases under control could eventually lead to a 62-fold increase in such heat blasts."

"Tyson, the country's biggest producer of chicken meat, says within 2 years, it expects to stop giving chickens antibiotics that humans also use. The decision echoes one by McDonald's last month."

"For the first time in more than 50 years, the federal government has recommended lowering the level of fluoride in drinking water."

"From the tortillas to the salsa to the chips and marinades, everything served at Chipotle will now be GMO-free."

"One of congressional Republicans' major attempts to regain a say over water resources projects while maintaining their self-imposed earmark ban may have hit a brick wall."

"A single pulse flow of water reconnects the ‘American Nile’ with the Sea of Cortez for the first time in decades"

"A federal appeals court ruled Friday that a group of California companies cannot sue to stop the Environmental Protection Agency’s (EPA) efficiency and greenhouse gas rules for heavy trucks."

"HOUSTON -- As Gina McCarthy spoke for a second straight year at one of the world's top energy gatherings, the U.S. EPA administrator defended a plan to cut carbon dioxide emissions and told the power industry to focus on its ability to innovate."

"As the Arctic melts and organic matter decays, vast stores of carbon in the permafrost will be released triggering an unstoppable feedback system."

"The number of breeding males in the greater sage-grouse population of the United States and part of Canada has declined by 56 percent in recent years, in a sign of trouble for the ground-dwelling bird, a study released on Friday showed."