National (U.S.)

"Federal judges [Tuesday] rejected challenges from both industry and environmental groups to U.S. EPA's air standards for lead smelters."

"Exposure to pesticides and other chemicals is linked to an increased risk of developing Parkinson's disease, according to a fresh look at some past research."

"Wal-Mart Stores pleaded guilty Tuesday to improperly dumping hazardous waste in California and Missouri, agreeing to pay almost $82 million in fines."

"A liberal watchdog group says the State Department’s inspector general (IG) is probing possible conflicts of interest in the federal environmental review of the proposed Keystone XL oil sands pipeline."

"Drivers who end up behind John Cooley this week will quickly lose their patience. Cruising around the eastern United States with his car window open, he slows down or stops every few hundred metres, cocks an ear and taps on a data-logger strapped into the passenger seat."

"One of America's corporate giants is investing billions of dollars in the new boom of oil and gas drilling that relies on a controversial extraction method known as fracking."

"FLAGSTAFF, Ariz. --  A uranium mining company seeking a mineral lease on state land in northwestern Arizona could have a hard time transporting the ore off-site because of the Navajo Nation's objections to an industry that left a legacy of death and disease among tribal members."

"A key satellite positioned to track severe weather in the eastern United States has failed, just as the 2013 Atlantic hurricane season is about to start."

"Bisphenol A is used to line drinks cans and in tests affected the way genes work in the brains of laboratory rats."

"Mistakes were made, and one narrative too readily embraced, in coverage of the blast. Meanwhile, The Dallas Morning News excelled."