Park historian Richard West Sellars is not flattering when he examines the history of the Park Service in his book "Preserving Nature in the National Parks."
A long, hot hike into - and back out of - the Grand Canyon takes the writer into the heart of a park that is beautiful, much visited, and still very dangerous.
A report called "Raptors and Climbers" by Kathryn Pyke of the Access Fund offers suggestions on protecting cliff-nesting raptors without banning rock climbing.
The Forest Service restricts some of the access off-road vehicles have to Idaho's Targhee National Forest.
The Park Service plans to restrict cars in Grand Canyon, Zion and Yosemite national parks, replacing them with light rail and buses.
Conservationists are unhappy about development company Jeld Wen Inc.'s proposal to build an "ecologically sensitive" ski resort at Pelican Butte in Oregon's Cascade Mountains.
Activists seek to protect Yellowstone's bison from another slaughter by physically shepherding wandering bison back onto protected land.