In the Coachella Valley, a tractor prepares ground for seeding a field with Sudangrass, mountains and blue sky in background; Coachella, California, United States of America

A man hiking near the Harding Icefield Trail with the Chugach Mountains and the Resurrection Valley in the background, Kenai Fjords National Park, Southcentral Alaska

A man hiking near the Harding Icefield Trail with the Chugach Mountains and the Resurrection Valley in the background, Kenai Fjords National Park, Southcentral Alaska

A man standing by a lake with his arms outstretched near the Harding Icefield Trail with the Chugach Mountains in the background, Kenai Fjords National Park, Southcentral Alaska

UK, Scotland, Glentree forest; Tweed Valley, Mountain bikers ascending hilly trail in sun near Peebles

Horses playing in a field near AberMawr bay on Pembrokeshire Coast Path, South West Wales; Pembrokeshire, Wales

Hawaii, Oahu, Kualoa Ranch, Horseback Riders In An Open Field. (Editorial Use Only)

Semi tractor-trailer on icy roads in the Prudhoe Bay Oil Field, Arctic Alaska, Winter

Fort Whyte Centre For Environmental Education With A Hot Air Balloon In Background, Winnipeg, Manitoba

Close up of a Hoary Marmot with Exit Glacier in the background, Kenai Fjords National Park, Southcentral Alaska

Two Homer residents walking on a path with Homer Spit and Poot Peak in the background, Kenai Peninsula, Southcentral Alaska, Autumn

Woman mountain biker rides through a field of wild geraniums at Kincaid Park in Anchorage, Alaska

Sign Of Bike Trail, Wrigley Field Stadium In Background