Cascades and elephant heads (little red elephants) (Pedicularis groenlandica), San Juan National Forest, Colorado, United States of America, North America

Elephant heads (little red elephants) (Pedicularis groenlandica), San Juan National Forest, Colorado, United States of America, North America

Confluence of the Little Colorado and Colorado Rivers, Grand Canyon National Park, UNESCO World Heritage Site, Arizona, United States of America, North America

An area of the Little Colorado River Gorge east of the Grand Canyon, Arizona, Uninted States of America, North America

Rustic log cabin in valley

A bottle of ethanol and some of the materials ethanol can be made of at the National Renewable Energy Laboratory, operated by the US Department of Energy, where scientists are developing economical processes for making cellulosic ethanol from non-edible p

Sand dunes with people, Southern Colorado, USA

Landscape with young woman standing on rock formation and contemplating turquoise water of Little Colorado River near its confluence with Colorado deep down in Grand Canyon, Grand Canyon, Arizona, USA