Andy Rouse / Polar Bear (Ursus maritimus) portrait in sea-ice landscape. Wide angle / fish-eye shot. Svalbard, Norway, September.

Brent Stephenson / Huge iceberg with streaked sky under expansive open sky. Drake Passage, near the South Shetland Islands, Antarctica, December.

Andy Rouse / Ice cliff and waterfall catching evening light. Austfonna Polar Ice Cap, Svalbard, Norway, August 2011.

Matthias Breiter / Meltwater lakes on Hubbard Glacier, Wrangell-St. Elias National Park, Alaska

Inaki Relanzon / Blue ice melt pool in snow near the peak of La Munia Circo. The Pyrenees, Aragon, Spain, May 2011.

Doug Allan / Icicles on pack ice melting, Canadian Arctic

Juan Carlos Munoz / Glacial melt water seen from the air. Deshielo glaciar. Southern Iceland, Europe, July 2009.

Floris van Breugel / Water from the spring melt of snow at high elevations creating an immense volume of water, California's Yosemite National Park, June.

Juan Carlos Munoz / Aerial view of River Tungnaa flowing over wetlands, with melt water from the Vatnajojull glacier, Iceland

Danny Green / Polar Bears (Ursus maritimus) greeting each other, as one emerges from water onto sea ice. Svalbard, Norway, July.

Danny Green / Ice in flowing river water. Scotland, UK, February.

Brent Stephenson / Huge iceberg with group of Chinstrap Penguins (Pygoscelis antarctica) close to the water. Drake Passage, near the South Shetland Islands, Antarctica, December.