Jet skiers and those who rent and sell machines to them are irate over a possible ban of the noisy watercraft from Lake Tahoe.
A Utah County's decision to permit helicopter skiing on a private ranch raises opposition from residents and backcountry skiers.
In his own words, Mac Carelli, owner of C&C Meats in Sheridan, Wyo., describes how he deals with bison carcasses.
While the Yellowstone bison are slaughtered , south of the park near Grand Teton National Park, cattle have grazed next to brucellosis-infected bison and elk for 75 years with no problems.
The federal agency APHIS has broken scientific protocol by experimenting with a live brucellosis vaccine in bison herds in national parks and a national wildlife refuge without knowledge and consent of the Park Service.
The deliberate slaughter of bison straying from Yellowstone National Park - killed because the brucellosis they may carry might endanger livestock - provokes a storm of protest, and calls into question the concept of wildlife management in the park.
The proposed widening and straightening of Highway 14-16-20, the link between Cody, Wyo., and Yellowstone National Park, raises tremendous controversy between tourism boosters and environmentalist critics.
Building the newest addition to Colorado's hut system for skiers and hikers meant long, cold hours of work at 11,300 feet in the Gore Range.
The FAA bans all commercial overflights of Colorado's Rocky Mountain National Park without much opposition.
Higher entrance fees at Yellowstone won't necessarily keep the park open, because the money needs to go to repair roads and buildings, park officials warn.
Environmentalists and Native Americans object to a proposed Park Service management plan that would develop bike and horse trails in New Mexico's Petroglyph National Monument.
The FAA's new rules for overflights at Grand Canyon will not ease the noise problem at all, critics say.
Musician Paul Winter decries the growth in aircraft noise in the Grand Canyon since he first recorded music in the park 30 years ago.
River guides and outfitters protest new drug-testing requirements begun in Grand Canyon National Park and soon to come to Utah's Canyonlands and Dinosaur National Monument.
"Teaming with Wildlife," a proposal to raise money for wildlife conservation and outdoor recreation by adding a small change to the cost of bird-seed, kayaks, hiking boots, etc., faces opposition from both the left and right.