Ice held up to the sun near the Antarctic Peninsula during the summer months, Southern Ocean, Polar Regions

View of the nearly full moon rising over snow-covered mountains on the Antarctic Peninsula, Antarctica, Polar Regions

Views of the Errera Channel, between the west coast of Antarctica and Ronge Island, Antarctica, Polar Regions

Views of the eastern side of the Antarctic Peninsula in the Weddell Sea, Antarctica, Polar Regions

Iceberg detail in and around the Antarctic Peninsula during the austral summer months, Southern Ocean, Antarctica, Polar Regions

Aguila glacier, Tierra del Fuego, Chile, South America

Glacial iceberg detail from ice calved off the Sawyer Glacier in Tracy Arm, Southeast Alaska, United States of America

A view of the tidewater glacier in Isbukta (Ice Bay) on the western side of Spitsbergen Island, Svalbard Archipelago, Norway

Aerial of the mountainous coastline around Kulusuk, Greenland, Polar Regions

Ice in all of its myriad forms in the Svalbard Archipelago, Norway, Arctic, Europe

Views of the Vasilievbreen (Vasiliev Glacier), in Isbukta (Ice Bay) near the island of Spitsbergen in Svalbard, Norway, Arctic, Europe

Tourists on board Arctic polar exploration cruise ship near Monaco glacier in summer, Liefdefjorden, Spitzbergen, Svalbard, Norway, Scandinavia, Europe

Expedition boat entering the Magdalenen Fjord, Svalbard, Arctic, Norway, Scandinavia, Europe

Guest Poppy (6) from the Lindblad Expedition ship National Geographic Explorer examines glacial ice near Petermann Island, Antarctica

Blue ice texture in the caves in Jˆkuls·rlÛn glacier, Iceland, North Atlantic Ocean

Blue ice texture in the caves in Jˆkuls·rlÛn glacier, Iceland, North Atlantic Ocean

Blue ice caves in Jˆkuls·rlÛn glacier, Iceland, North Atlantic Ocean

Climbers make their way to Advanced Basecamp (ABC) through the massive Western Cwm (glacial valley) on the Southeast Ridge route on Mt. Everest, Nepal. Everest's Southwest Face rises to the left with Lhotse and the Lhotse Face in the distance. Jake Norton, 4, 20, 2002, Western Cwm, Everest, Nepal.

Person on Glacier, McCarthy, Alaska.

Rob Raker ascends a vertical pitch of glacial ice high on the Cassin Ridge route of Denali (Mt. McKinley), Alaska in May 1990. This pitch is the technical crux of the route which ascends the South Face to the summit at 20,320 feet, the highest point in North America. (Photo by Kevin Steele, Aurora)

TORRES DEL PAINE NATIONAL PARK, PATAGONIA, CHILE. Hikers enjoy one of the best national parks in South America on a sunny day. With steep peaks full of hanging glaciers and glacial silt-filled lakes, Torres del Paine is one of the greatest attractions on Earth.

Woman looking into chasm in glacier near McCarthy, Alaska.

TORRES DEL PAINE NATIONAL PARK, PATAGONIA, CHILE. Hikers enjoy one of the best national parks in South America on a sunny day. With steep peaks full of hanging glaciers and glacial silt-filled lakes, Torres del Paine is one of the greatest attractions on Earth.

TORRES DEL PAINE NATIONAL PARK, PATAGONIA, CHILE. Hikers enjoy one of the best national parks in South America on a sunny day. With steep peaks full of hanging glaciers and glacial silt-filled lakes, Torres del Paine is one of the greatest attractions on Earth.

Coburg Island In The Canadian Arctic

Sea kayakers paddling in glacial lagoon at a glacier terminus on the coast of Alaska

Sea kayakers paddling in glacial lagoon at a glacier terminus on the coast of Alaska

Martial mountain, glacial melt, Tierra del Fuego, Argentina

Martial mountain, glacial melt, Ushuaia, Tierra del Fuego, Argentina