Stefan Christmann / Emperor penguin (Aptenodytes forsteri) breeding colony, mainly males brooding eggs, huddled together on sea ice. Atka Bay, Antarctica. June.
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Erlend Haarberg / Rock face reflected in lake surface with floating blue ice sheets, Ovre Pikhaugvatnet lake, Glomdalen valley, Saltfjellet-Svartisen National Park, Norway, August 2015.
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Sven Zacek,Sven Zacek / Dawn over frozen Lake Peipsi, with sheet ice formations caused by strong wind. Eastern Estonia, December 2012.
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Sven Zacek,Sven Zacek / Ice sheets before sunrise in Estonia. December 2009.
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Andy Rouse / Polar Bear (Ursus maritimus) jumping between ice sheets, Svalbard, Norway, September 2009
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Doug Allan / Mountains and inland ice sheets of Svalbard, Norway
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Orsolya Haarberg / Ice sheets floating on the surface of Ovre Pikhaugvatnet Lake, Saltfjellet-Svartisen National Park, Norway, August 2015.
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Orsolya Haarberg / Ice sheets floating on the surface of Ovre Pikhaugvatnet Lake, Saltfjellet-Svartisen National Park, Norway, August 2015.
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Roy Mangersnes / Fragments of ice drifting under full moon. The ice sheet was at a record 83 degrees north, Svalbard, September, 2013.
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Bryan and Cherry Alexander / Small iceberg off Cuverville Island with Anvers Island as a backdrop, Antarctic Peninsula, Antarctica.
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Bryan and Cherry Alexander / Polar bear (Ursus maritimus) on sea ice, with a strong wind swirling snow around his feet. Canada.
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Bryan and Cherry Alexander / Polar bears (Ursus maritimus) running over sea ice in blowing snow at sunset. Cape Churchill, Manitoba, Canada.