"The Rio Grande is the lifeblood of South Texas. Cities and farmers on both sides of its international border depend on its water. A 70-year-old treaty between the United States and Mexico is supposed to keep the river’s water flowing. But in the last three years, Mexico has fallen behind on its end of the deal. That has heightened tensions between the two countries and jeopardized the future of agriculture in the Rio Grande Valley."

"CHICAGO -- When city students arrived for the first day of school under the blazing temperatures of a Midwest heat wave, staff greeted them with some unusual school supplies: water bottles, fans and wet towels to drape around their necks."

"Eating raw oysters in the summertime is always risky; aqueous pathogens peak when the ocean is warm, which is part of why folk wisdom suggests one should only eat raw shellfish in months with an 'R' in the name. But this summer's been riskier than ever."

"Steps such as quitting smoking and controlling blood pressure and cholesterol could save more than 200,000 Americans a year, a report finds."

"The U.S. 9th Circuit Court of Appeals deals a blow to a years-long effort by Drakes Bay Oyster Co. to extend its lease in Point Reyes National Seashore."

"SAN FRANCISCO -- The use of pesticides and the planting of genetically engineered crops on U.S. national wildlife refuges are illegal and damaging to the environment, say four advocacy groups who have filed a federal lawsuit to halt these practices on national wildlife refuges across the Midwest."

"Paul Bailey made the White House pitch on July 31. Flanked by six colleagues from the American Coalition for Clean Coal Electricity, the coal industry’s most public voice, Bailey pressed the case for 'achievable' greenhouse gas emissions standards for coal-fired power plants."

"NARAHA, Japan -- In this small farming town in the evacuation zone surrounding the stricken Fukushima Daiichi nuclear power plant, small armies of workers in surgical masks and rubber gloves are busily scraping off radioactive topsoil in a desperate attempt to fulfill the central government’s vow one day to allow most of Japan’s 83,000 evacuees to return. Yet, every time it rains, more radioactive contamination cascades down the forested hillsides along the rugged coast."

Conservation biologists have successfully trained dogs to use their sharp sense of smell to help in a variety of conservation tasks.

"Glaciers in the Alps of Europe pose a scientific mystery. They started melting rapidly back in the 1860s. In a span of about 50 years, some of the biggest glaciers had retreated more than half a mile."