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.
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.
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