Ingo Arndt / Perito Moreno glacier, calving sequence 3/3 Patagonia, Argentina

Ingo Arndt / Perito Moreno glacier, calving sequence 2/3 Patagonia, Argentina

Orsolya Haarberg / Glacier ice floating in the Jokulsarlon glacier lagoon, with Fjallsjokull in the background, sunrise, Iceland, September 2010

Jack Dykinga / Moreno Glacier calving iceberg in Glaciers National Park, Argentina

Ralph Pace / Tourists and calving glacier, South Sawyer Glacier, Alaska

Ingo Arndt / Ice calving from terminal moraine, Perito Moreno Glacier, Los Glaciares National Park, Patagonia, Argentina

Ashley Cooper / Jokulsarlon ice lagoon, Iceland. September 2010.

Ashley Cooper / Arched Iceberg collapsing into the sea, calved from the Jacobshavn glacier or Sermeq Kujalleq, Greenland, July 2008.

Ashley Cooper / Arched Iceberg collapsing into the sea, calved from the Jacobshavn glacier or Sermeq Kujalleq, Greenland, July 2008.

Ashley Cooper / Small collapse of ice from the Russells Glacier, Kangerlussuaq, Greenland. July 2008.

Ashley Cooper / Collasing ice from the Russells Glacier, Kangerlussuaq, Greenland. July 2008.

Ashley Cooper / The Russells Glacier, Kangerlussuaq, Greenland. July 2008.