"This fall may prove to be a watershed moment for the parks," as a six-part PBS series by Ken Burns highlights their glories and their problems -- air pollution, a changing climate, and needed upkeep among them.

"Bureau of Land Management's proposal for the West Mojave 'does not contain a reasonable range of alternatives' to limit off-road-vehicle routes in the sensitive habitat, the ruling states."

"Opponents of offshore oil drilling in the Arctic are making a last-ditch effort to convince the Obama administration to impose the same kind of moratorium on oil and gas development that it did on major commercial fishing in the Far North."

"Two-thirds of the world's major deltas, home to nearly half a billion people, are caught in the scissors of sinking land and rising seas, according to a study published Sunday."

"SAN FRANCISCO -- In a ruling with national implications for public lands, the U.S. Court of Appeals for the Ninth Circuit today overturned the federal government's approval of a land exchange with mining giant Asarco, Inc."

"Hot Springs National Park, Yellowstone, Yosemite, and Grand Canyon National Parks and Mt. Hood National Forest will be the first sites commemorated in a new quarter-dollar program announced today by the United States Mint."

"Citing 'clear evidence' of likely environmental damage, the Obama administration has moved toward revoking the largest mountaintop-removal permit in West Virginia history."

A rare chance for people to walk through the mile-long tunnel that gives entrance to Zion National Park was part of the park's centennial celebration.

The recent Los Padres fire exemplifies a growing trend: Mexican drug cartels setting up shop in California wilderness and parkland.

In the Yaak Valley of Montana, environmentalists have been talking to loggers, snowmobilers and other longtime opponents of wilderness protection about the future of public lands. Rick Bass writes of his involvement in a cooperative effort that could lead to the first wilderness-area designation in the state in a quarter-century.

Should Mt. St. Helens, which erupted almosty 30 years ago, be a National Park? There is a debate over whether the land should be used for recreation or to study how landscapes recover from violent disturbance.

"The reclassification of nearly 1 million acres of land around the Grand Canyon to prevent new mining claims comes with a fundamental change in how the U.S. Forest Service does business with mining companies."

"The U.S. Army Corps of Engineers reissued a permit Friday to Coeur Alaska Inc. for its Kensington mine plans, clearing the way for construction to resume on the final component of the complex that's been on hold since 2006 because of environmentalists' lawsuits."

"A limestone 'quarry alley' 45 miles west of downtown Louisville resembles the scarred landscapes of eastern Kentucky, flattened by blasting for coal. ... Limestone, it turns out, is the key ingredient for stripping sulfur dioxide from smokestacks, helping to reduce acid rain and asthma-inducing haze."

"Water managers and the White House signed a crucial contract Thursday that promises a much-needed infusion of federal dollars for the Everglades."