Hang-glider pilots launch themselves over Yosemite Valley during a wildfire, a marine biologist takes a memorable dive through a Channel Island kelp forest and an arborist scales to the very top of a towering redwood.

Wildlife filmmakers capture incredible footage of a grizzly and wolves competing for food in Yellowstone National Park, climber Conrad Anker does a late winter ice climb in Hyalite Canyon and a summer rock climb on Devils Tower.