While 4.2 million acres of national forest land is declared roadless, the 2012 rule allows for energy development and road construction in some areas.
Conservation group suggests several measures to mitigate impacts.
As the U.S. moves closer to removing Wyoming gray wolf populations from the endangered species list, concerns about the fate of wolves remain.
New conclusions surface about the mighty supervolcano in Yellowstone National Park, often cited for a massive eruption that covered the region in hot ash.
Measurements at Niwot Ridge research station west of Boulder indicate changes to Colorado mountain zones are underway.