Low angle view of a tree, Redwood National Park, California, USA

Person skiing through a snow covered trail with Mount Whyte in the background, Banf National Park, Alberta, Canada

Aspen trees in a forest, Carson Peak, Californian Sierra Nevada, California, USA

Aspen trees with mountains in the background, Carson Peak, Californian Sierra Nevada, California, USA

Aspen trees in a forest, Carson Peak, Californian Sierra Nevada, California, USA

Aspen trees in a forest, Carson Peak, Californian Sierra Nevada, California, USA

High angle view of Aspen trees in a forest, Carson Peak, Californian Sierra Nevada, California, USA

High angle view of Aspen trees in a forest, Carson Peak, Californian Sierra Nevada, California, USA

Reflection of clouds in water, Maligne Lake, Jasper National Park, Alberta, Canada

Uncompahgre National Forest Colorado USA

River flowing around rocks at sunrise, Sunrift Gorge, US Glacier National Park, Montana, USA

Uncompahgre National Forest Colorado USA

Trees in a forest, Half Dome, Yosemite Valley, Yosemite National Park, California, USA

Reflection of trees in a river, Merced River, El Capitan, Yosemite National Park, California, USA

Fog over mountains, Yosemite National Park, California, USA

Giant sequoia (Sequoiadendron giganteum) trees in a park, Redwood National Park, California, USA

Three-leaf clovers around a tree, Redwood National Park, California, USA

Clouds over mountains, El Capitan, Yosemite Valley, Yosemite National Park, California, USA

Mule deer (Odocoileus hemionus) standing in a field, Yosemite National Park, California, USA

Mule deer (Odocoileus hemionus) standing in a field, Yosemite National Park, California, USA

Trees in front of sand dunes, Great Sand Dunes National Monument, Colorado, USA

Moss hanging from trees, Hoh Rainforest, Washington State, USA

Waterfall in a forest, Bridal Veil Falls, Yosemite Valley, Yosemite National Park, California, USA

Close-up of a Mule deer (Odocoileus hemionus), Yosemite National Park, California, USA

Park Ranger

Vacation in Yellowstone 2004 Linda Braucht (20th C. American) Computer graphics

Silhouette of three men standing on green hills and holding letters ISO to illustrate standardized forestry

An illustration of a couple hiking together

Trees in a forest, Yosemite National Park, California, USA