Sven Zacek / Cross-country skiier on a moonlit night admiring the Northern Lights (Aurora borealis), Norway, March 2013.

Ole Jorgen Liodden / Boy on skis going up slope, framed by snow laden tree, Norway, February 2014.

Markus Varesvuo / Alpine choughs (Pyrrhocorax graculus) flying over snow covered mountain with tracks from snow boarders in the snow, Morocco, February 2009

Christophe Courteau / Tourists and guide using snowshoes on an ecotourism trekking holiday, Svalbard, Norway, June, 2012. Model released.

Floris van Breugel / A skier glides past an erupting geyser in the Old Faithful geyser basin in Yellowstone National Park. The cold temperatures in the winter cause the geysers to release more steam than usual making the...

Andrew Parkinson / 2020VISION / A male (left) and female Ptarmigan (Lagopus mutus) in winter plumage taking flight from an ice field as a skier passes by, Cairngorms National Park, Scotland, UK, March 2011. 2020VISION Exhibition.

Sven Zacek / People in a cross-country skiing competition. Tartu, Estonia, Europe, February.

Bryan and Cherry Alexander / Nenets boy learning to ski. Yamal, Siberia, Russia, 1993.

Bryan and Cherry Alexander / Reindeer (Rangifer tarandus) racing, Inari, North Finland, 1996.

Uri Golman / Photographer Uri Golman on cross country skies in snow blizzard, Scoresbysund, North East Greenland, March 2009. Model released

Jerry Monkman / A man cross country skiing along the coast at Odiorne Point State Park in Rye, New Hampshire, USA. Model Released. winter 2007

Jerry Monkman / Telemark skiing (with dog following) "The Seven" in the Great Gully on the headwall of King Ravine, White Mountains, New Hampshire, USA. King Ravine is a glacial cirque on the north side of Mount Adam...