From shrinking national-monument borders to changing management plans and budgets, the threats are coming from many angles.
Why Westerners disagree on protecting public lands.
The Eritrean runner tested positive for a banned asthma medication at two world championships this summer, and his title has been revoked.
The 42-year-old Boulder runner covered the 222 miles in 3 days 7 hours 57 minutes.
With podium dreams dashed, these runners pushed through mental defeat, injury and exhaustion to reach the finish line.
Allen fell 150 feet off an exposed ridge during Norway's Tromsø Skyrace, and is now on the road to recovery.
Amid one of the deepest fields in trail-ultra history, Americans had a strong showing.
The two American runners both claimed victory in a race typically dominated by Europeans.
The two semi-pro road racers have been dabbling in the trails for a few years.
The jack-of-all-distances finished 10th in the Leadville 100, and then seven hours later ran the Pikes Peak Marathon.