Hiroya Minakuchi / Sea ice, Weddell Sea, Antarctic Peninsula, Antarctica

Todd Mintz / Narwhal (Monodon monoceros) pod at surface with one tusk visible, Arctic Bay, Baffin Island, Canada, June

Yva Momatiuk & John Eastcott / Gentoo Penguin (Pygoscelis papua) on small ice floe, Gerlache Passage, Antarctica

Suzi Eszterhas / Adelie Penguin (Pygoscelis adeliae) group jumping off iceberg into icy water, Paulet Island, Antarctica

Colin Monteath / Heavy pack ice, Terre Adelie Land, east Antarctica

Jim Brandenburg / Polar Bear (Ursus maritimus) walking across ice floes, Ellesmere Island, Nunavut, Canada

Flip Nicklin / Polar Bear (Ursus maritimus) hauling out on ice floe, Wager Bay, Canada

Colin Monteath / Adelie Penguin (Pygoscelis adeliae) group on icefloe in Hope Bay, Antarctic Peninsula, Antarctica

Colin Monteath / Adelie Penguin (Pygoscelis adeliae) group diving from icefloe in Hope Bay, Antarctic Peninsula, Antarctica

Norbert Wu / Ice floes that have broken off sea ice edge in late summer, coast guard icebreaker in background, McMurdo Sound, Antarctica

Jim Brandenburg / Arctic Wolf (Canis lupus) on ice floe, Ellesmere Island, Nunavut, Canada

Tui De Roy / Adelie Penguin (Pygoscelis adeliae) group crowding on melting summer ice floe, Possession Island, Ross Sea, Antarctica

Tui De Roy / Adelie Penguin (Pygoscelis adeliae) group crowding on melting summer ice floe, Possession Island, Ross Sea, Antarctica

Flip Nicklin / Polar Bear (Ursus maritimus) about to haul out on ice floe, Wager Bay, Canada

Jim Brandenburg / Arctic Wolf (Canis lupus) leaping onto ice floe, Ellesmere Island, Nunavut, Canada

Jim Brandenburg / Arctic Wolf (Canis lupus) on ice floe, Ellesmere Island, Nunavut, Canada

Jim Brandenburg / Polar Bear (Ursus maritimus) running across ice, Ellesmere Island, Nunavut, Canada

Jim Brandenburg / Polar Bear (Ursus maritimus) walking on ice floe, Ellesmere Island, Nunavut, Canada

Mitsuaki Iwago / Icebergs and ice floes in the Weddell Sea, Antarctica

Tui De Roy / Broken fast ice under midnight sun and impending storm, Edward VIII Bay, Kemp Coast, east Antarctica

Tui De Roy / Adelie Penguin (Pygoscelis adeliae) group crowding on melting summer ice floe, Possession Island, Ross Sea, Antarctica

Tui De Roy / Glacial tongue of Dugdale and Murray Glaciers descending the Admiralty Mountains into Robertson Bay, Victoria Land, Antarctica

Tui De Roy / Bearded Seal (Erignathus barbatus) resting on ice floe near Wagon Way Glacier, Magdalenefjorden, Spitsbergen, Svalbard, Norwegian Arctic

Norbert Wu / Coast guard icebreaker travels through ice floes which have broker off sea ice edge in late summer, McMurdo Sound, Antarctica

Tui De Roy / Adelie Penguin (Pygoscelis adeliae) group leaping ashore onto ice ledge, Foyn Island, Possession Islands, Ross Sea, Antarctica

Tui De Roy / Atlantic Walrus (Odobenus rosmarus rosmarus) bachelor bulls on ice floe, North Coast Spitsbergen, Svalbard, Norwegian Arctic

Tui De Roy / Adelie Penguin (Pygoscelis adeliae) group crowding on melting summer ice floe, Possession Island, Ross Sea, Antarctica

Tui De Roy / Adelie Penguin (Pygoscelis adeliae) group crowding on melting summer ice floe, Possession Island, Ross Sea, Antarctica

Tui De Roy / Adelie Penguin (Pygoscelis adeliae) group crowding on melting summer ice floe, Possession Island, Ross Sea, Antarctica

Tui De Roy / Bearded Seal (Erignathus barbatus) scratching its chin while resting on ice floe, Kongsfjorden, Spitsbergen, Svalbard, Norwegian Arctic

Flip Nicklin / Bearded Seal (Erignathus barbatus) male resting on ice floe with head dyed red from the high iron content of ocean mud in which he hunts for shrimp and clams, Svalbard, arctic Norway

Colin Monteath / Ice floes in lake, Tasman Glacier, Mount Cook National Park, New Zealand

Colin Monteath / Ice floes in lake, Tasman Glacier, Mount Cook National Park, New Zealand

Colin Monteath / Ice floes in lake, Tasman Glacier, Mount Cook National Park, New Zealand

Colin Monteath / Ice floes in lake, Tasman Glacier, Mount Cook National Park, New Zealand

Konrad Wothe / Harbor Seal (Phoca vitulina) mother and pup on ice floe, Alaska

Norbert Wu / Crabeater Seal (Lobodon carcinophagus) with scars from Leopard Seal (Hydrurga leptonyx), Antarctic Peninsula, Antarctica

Colin Monteath / Icefloe near Mount Francais, Anvers Island, Neumayer Channel, Antarctic Peninsula, Antarctica

Ingo Arndt / Leopard Seal (Hydrurga leptonyx) resting on ice floe, Cumberland East Bay, South Georgia Island

Steven Kazlowski / Polar bear (Ursus maritimus) perches on ice floe along Spitsbergen and the northwest coast of the Svalbard Archipelago, Norway, Greenland Sea, July

Steven Kazlowski / Bearded seals (Erignathus barbatus) cow and calf rest on sea ice floating off Spitsbergen and the northwest coast of the Svalbard Archipelago, Norway, Greenland Sea, July

Hiroya Minakuchi / Iceberg with arch and ice floes, Antarctica

Flip Nicklin / Temporary hunting camp on ice floe, Admiralty Inlet Arctic Bay, Canada

Matthias Breiter / Harbor Seal (Phoca vitulina) on ice floe, Sawyer Glacier, Alaska

Matthias Breiter / Harbor Seal (Phoca vitulina) group hauled out on ice floes below the terminus of Hubbard Glacier, Alaska

Colin Monteath / Lemaire Channel reflection at sunset, Antarctic Peninsula, Antarctica

Hiroya Minakuchi / Bow of cruise ship with pack ice, Antarctic Peninsula, Antarctica

Kevin Schafer / Fogbow over ice floes, Svalbard, Norway

Kevin Schafer / Ice floes and fog, Svalbard, Norway

Kevin Schafer / Polar Bear (Ursus maritimus) on ice floe, Svalbard, Norway

Kevin Schafer / Glaucous Gull (Larus hyperboreus) group in front of Monaco Glacier, Leifdefjorden, Svalbard, Norway

Donald M. Jones / Timber Wolf (Canis lupus) stepping on ice floe with elk antlers from previous kill with Common Raven (Corvus corax) flying off, Yellowstone National Park, Wyoming

Jan Vermeer / Harp Seal (Phoca groenlandicus) pup on ice floe, Magdalen Islands, Gulf of Saint Lawrence, Canada

Stephen Belcher / Adelie Penguin (Pygoscelis adeliae) on ice floes, Antarctic Peninsula, Antarctica

Matthias Breiter / Sawyer Glacier, Tracy Arm Fjord, Alaska

Matthias Breiter / Sawyer Glacier, Tracy Arm Fjord, Alaska

Flip Nicklin / Pancake ice, Antarctica

Flip Nicklin / Gentoo Penguin (Pygoscelis papua) jumping from icefloe to icefloe, Antarctica

Flip Nicklin / Gentoo Penguin (Pygoscelis papua) porpoising among icefloes, Antarctica

Flip Nicklin / NGS Endeavour cruise ship near glacier and coastline, Antarctica

Norbert Wu / Ice floes that have broken off sea ice edge in late summer, McMurdo Sound, Antarctica

Colin Monteath / Mount Erebus at midnight with ice floes in McMurdo Sound, Ross Island, Antarctica

Colin Monteath / Ice floes, McMurdo Sound, Ross Sea, Antarctica

Colin Monteath / Ice floes, northern Ross Sea, Antarctica

Colin Monteath / Tourists on bow of Marina Svetaeva approaching Cape Adare, Antarctica

Colin Monteath / Ice floes at sunset near Mertz Glacier, east Antarctica

Colin Monteath / Ice floes at sunset near Mertz Glacier, east Antarctica

Colin Monteath / Ice floes at sunset near Mertz Glacier, east Antarctica

Konrad Wothe / Icefloe in Endicott Arm, Inside Passage, southeast Alaska

Konrad Wothe / Harbor Seal (Phoca vitulina) group on icefloe, Alaska

Konrad Wothe / Harbor Seal (Phoca vitulina) group on icefloe, Alaska

Michio Hoshino / Harp Seal (Phoca groenlandicus) swimming in drift ice, Canada

Kevin Schafer / Icebergs, western Greenland

Flip Nicklin / Polar Bear (Ursus maritimus) swimming, Wager Bay, Canada

Flip Nicklin / Polar Bear (Ursus maritimus) swimming, Wager Bay, Canada

Yva Momatiuk & John Eastcott / Floating ice floes and blue tabular iceberg, near South Georgia Island

Yva Momatiuk & John Eastcott / Ice floes and blue tabular iceberg, near South Georgia Island

Yva Momatiuk & John Eastcott / Cumulus clouds in blue sky over sea with ice chunks and snowy mountains of Allardyce Range, Salisbury Plain, South Georgia Island

Yva Momatiuk & John Eastcott / Ice columns and broken ice floes of Fortuna Glacier descending to sea, Antarctic Bay, South Georgia Island

Yva Momatiuk & John Eastcott / Ice columns and broken ice floes of Fortuna Glacier descending to sea, Antarctic Bay, South Georgia Island

Yva Momatiuk & John Eastcott / Ice chunks calved off Twitcher Glacier floating and melting in sea, South Georgia Island

Yva Momatiuk & John Eastcott / Ice chunks calved off Twitcher Glacier floating and melting in sea, South Georgia Island

Yva Momatiuk & John Eastcott / Iceberg sculpted by waves and loose ice chunks floating in sea as global warming causes faster melting of ice, South Georgia Island

Yva Momatiuk & John Eastcott / Iceberg sculpted by waves and loose ice chunks floating in sea as global warming causes faster melting of ice, South Georgia Island

Yva Momatiuk & John Eastcott / Blue iceberg and ice floes floating in sea near Neumayer Glacier, South Georgia Island

Yva Momatiuk & John Eastcott / Blue iceberg and ice floes floating in sea near Neumayer Glacier, South Georgia Island

Yva Momatiuk & John Eastcott / Blue iceberg and ice floes floating in sea near Neumayer Glacier, South Georgia Island

Yva Momatiuk & John Eastcott / Blue iceberg and ice floe floating in sea near Neumayer Glacier, South Georgia Island

Yva Momatiuk & John Eastcott / Blue iceberg and ice floes near Neumayer Glacier, South Georgia Island

Yva Momatiuk & John Eastcott / Blue iceberg and ice floes near Neumayer Glacier, South Georgia Island

Jan Vermeer / Crabeater Seal (Lobodon carcinophagus) on ice floe, Antarctica

Jan Vermeer / Chinstrap Penguin (Pygoscelis antarctica) trio on ice floe, Southern Thule, South Sandwich Islands, Antarctica

Jan Vermeer / Chinstrap Penguin (Pygoscelis antarctica) group on ice floes, Southern Thule, South Sandwich Islands, Antarctica

Jan Vermeer / Emperor Penguin (Aptenodytes forsteri) jumping from water to ice floe, Antarctica

Konrad Wothe / Glaucous Gull (Larus hyperboreus) on ice floe, Spitsbergen, Norway

Konrad Wothe / Bearded Seal (Erignathus barbatus) on ice floe, Spitsbergen, Norway