Danny Green / Polar bear (Ursus maritimus) two walking in snowy landscape with glacier behind. Svalbard, Norway, April 2018.

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

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

Ingo Arndt / Coastal edge of Perito Moreno glacier, Patagonia, Argentina 2002

Ingo Arndt / Aletsch glacier, Wallis, Alps, Switzerland

Ingo Arndt / Aletsch glacier, Wallis, the Alps, Switzerland

Pal Hermansen / Barnacle geese (Branta leucopsis) with goslings, swimming past icebergs, Jokulsarlon, Iceland, June.

Erlend Haarberg / Photographer silhouetted on Mt Luottotjakka overlooking the Arjep Luottojekna and Nuortap glaciers at sunset, Sarek National Park, World Heritage Laponia, Swedish Lapland, Sweden, August 2013.

Sven Zacek / View through glacier ice towards snow-covered mountains in Kongsfjorden fjord in Svalbard, Norway. June 2015.

Pal Hermansen / Barnacle geese (Branta leucopsis) with goslings, Jokulsarlon ice field, Iceland, June.

Ole Jorgen Liodden / Landscape of Lillehooksbreen glacier at Svalbard, Norway, July 2008.

Erlend Haarberg / Meltwater from Engenbreen glacier, Meloy, Nordland, Norway, August.