Scientist finds Jeffrey pine trees at record mountain heights, suggesting climate-driven shifts in Sierra Nevada.

Forest Ranger Corenne Black has hiked more than 1,000 peaks around the world and still has a lengthy to-do list.

but harrowing, cliffs and ridgelines. The Forest Bureau maintains simple, high-mountain cabins for overnight backpackers.

UC Davis Professor Hugh Safford was hiking for pleasure in California's High Sierra when he stumbled upon a new elevation ...