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Man enjoys the view of the old amphitheatre and snowy peak at sunset, Alba Fucens, L'Aquila, Apennines, Abruzzo, Italy, Europe

Mountain bikers take a break near a moss covered Tibetan chorten in the Himalayas in the Gosainkund region, Nepal, Asia

Mountain bikers cycle along a snow covered slope in the Himalayas with views of the Langtang range in the distance, Nepal, Asia

Mountain biking in the Himalayas with views of the Langtang mountain range in the distance, Nepal, Asia

Mountain biking in the Himalayas with views of the Langtang mountain range in the distance, Nepal, Asia

Mountain bikes speed past in a blur along a Enduro style single track trail in the Nepal Himalayas near the Langtang region, Nepal, Asia

Mountain bikers take a rest on an Enduro style single track trail in the Nepal Himalayas near the Langtang region, Nepal, Asia

Mountain bikers carry their bikes up a snow covered hillside in the Nepal Himalayas with views of the Langtang mountain range, Nepal, Asia

Mountain biking in the Himalayas with views of the Langtang mountain range in the distance, Nepal, Asia

Mountain biking in the Himalayas with views of the Langtang mountain range in the distance, Nepal, Asia

Mountain bikers in the little village of Sing Gompa in the Gosainkund region in the Himalayas, Langtang region, Nepal, Asia

Mountain bikers cycle along a snow covered slope in the Himalayas with views of the Langtang range in the distance, Nepal, Asia

Mountain bikers descend a snow covered slope in the Himalayas with views of the Langtang range in the distance, Nepal, Asia

Mountain biking along a Enduro style single track trail in the Nepal Himalayas near the Langtang region, Nepal, Asia

Mountain biking in the Himalayas with views of the Langtang mountain range in the distance, Nepal, Asia

Mountain biking on a snow covered slope in the Himalayas with views of the Langtang mountain range in the distance, Nepal, Asia

Hightech windmills, some standing 500 feet high when their blades are vertical, hum on the Altamont Pass of California as they produce clean electricity. Wind energy is the world's fastest growing energy source, expanding 25, 35 percent each year. In 2001, roughly 6000 megawatts of new wind capacity was installed around the world, enough to power 2 million American homes.

Mid adult woman looking through coin operated binoculars, rear view, New River Gorge National River, Fayetteville, West Virginia, USA

Mid adult woman looking through coin operated binoculars, rear view, New River Gorge National River, Fayetteville, West Virginia, USA

Mid adult woman holding coin operated binoculars, focus on hands, New River Gorge National River, Fayetteville, West Virginia, USA

Portrait of mid adult couple, sitting together on rock in waterfall, New River Gorge National River, Fayetteville, West Virginia, USA