National (U.S.)

"By trading oil for batteries, the struggling U.S. Postal Service could transform its fleet vehicles into overnight moneymakers that deliver much more than the daily mail. The cash-strapped agency has the potential to earn millions by storing and stabilizing some of the nation’s grid energy in mail trucks during off-peak hours."

"Chemicals found in food cans, nail varnish and shampoos could be triggering early puberty in girls, putting them at greater risk of cancer and diabetes, scientists believe."

"Environmental activists this week are stepping up a battle to protect U.S. EPA's ability to regulate greenhouse gas emissions, staging demonstrations and lobbying lawmakers at their local offices."

"Environmentalists demanded Tuesday that Puerto Rico's government order new tests to determine whether coal ash being used for home and road construction in the U.S. island's south is free of toxic material."

"Many streams and rivers in the United States are getting warmer, with the greatest increases in urbanized areas, according to research to be published in an upcoming edition of the journal Frontiers of the Ecology and the Environment."

"113 facilities in the Houston area have been identified as potential targets, yet nearly a decade after 9/11, securing them remains a work in progress."

Rescue operations continue at the West Virginia mine where an explosion killed 25. "The Massey Energy Company, the biggest coal mining business in central Appalachia and the owner of the Upper Big Branch mine, has drawn sharp scrutiny and fines from regulators over its safety and environmental record."

"More than 50 Indiana National Guardsmen have filed a lawsuit in Houston claiming KBR failed to warn them about exposure to carcinogenic chemicals at an Iraqi water facility they were guarding."

"NASA, the agency known for exploring space, will be spending a lot more time studying Earth in the next few years. The Obama administration has proposed a budget for NASA that includes billions of dollars for satellites and other tools to help scientists investigate Earth-bound problems, especially climate change."