"A Canadian mining company has come one step closer to building a mile-wide, half-mile-deep open-pit copper mine on public land 30 miles south of Tucson. On Thursday, Arizona’s Department of Environmental Quality granted Rosemont Copper, a subsidiary of Augusta Resource of Vancouver, a crucial air quality permit, saying emissions from the proposed mine would not violate federal standards for carbon monoxide, nitrogen and sulfur dioxide, or fine and large particles."

"In south Texas, where the Rio Grande divides the United States from Mexico, three of the last remaining sections of border fence -- approved more than five years ago -- remain unbuilt."

"The Railroad Commission of Texas regulates one of the most advanced industries in the world — oil and gas drilling. Yet the commission's software systems, many of its rules and even its name are from another era."

"Last fall, remote cameras in a rugged expanse of desert grasslands in Southern Arizona captured arresting images of a jaguar slinking through the underbrush, its yellow eyes fixed on some distant sight. The photos add to the dozen or so documented sightings of the endangered cat on American soil in the last century."

"In a bid to clean up one of the nation’s dirtiest coal-fired power plants without causing economic harm to the Navajo Nation that surrounds it, the Environmental Protection Agency indicated on Friday that it would give the plant’s owners five extra years, until 2023, to install expensive state-of-the art emissions reduction equipment."

"WEATHERFORD, Texas -- When a man in a Fort Worth suburb reported his family's drinking water had begun "bubbling" like champagne, the federal government sounded an alarm: An oil company may have tainted their wells while drilling for natural gas. At first, the Environmental Protection Agency believed the situation was so serious that it issued a rare emergency order in late 2010 that said at least two homeowners were in immediate danger from a well saturated with flammable methane. More than a year later, the agency rescinded its mandate and refused to explain why."

The U.S. Supreme Court agreed Friday to take up the controversy of the thirsty Fort Worth area's bid to get water from Oklahoma.

"Residents of Gardendale, a suburb near the hub of the west Texas oil industry, face having up to 300 wells in their backyards."

"The low-income neighborhood of older wood-frame homes in West Dallas is a far cry from the suburb of newly built brick houses in Frisco 30 miles to the north. But the two North Texas communities share a bond: Both were contaminated by industrial lead for nearly half a century."