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

Andy Rouse / Waterfall from ice cliffs with ice-cap stretching into the distance. Austfonna Polar Ice Cap, Svalbard, Norway, August 2011.

Andy Rouse / Polar ice cap at sunset. Austfonna Polar Ice Cap, Svalbard, Norway, August 2011.

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

Andy Rouse / Waterfall from ice cliffs with ice-cap stretching into the distance. Austfonna Polar Ice Cap, Svalbard, Norway, August 2011.

Michael Pitts / Kittiwake {Rissa tridactyla} flying over arctic ice cap

Andy Rouse / Ice cliffs in evening light. Austfonna Polar Ice Cap, Svalbard, Norway, August 2011.

Bryan and Cherry Alexander / Cap of glacial ice adorning a mountain summit. Antarctic Peninsula, Antarctica, October 2006.

Eric Baccega / Liddon cliffs and Liddon cap. Devon Island, Nunavut, Canada, August 2010

Eric Baccega / View of Liddon cliffs and Liddon cap, with bird flying along shore, Devon Island, Nunavut, Canada, August 2010