Bryan and Cherry Alexander / Ice floes as sea ice breaks up in summer off coast of Northwest Greenland, 1980.

Tim Laman / Aerial view of lowland rainforest, Borneo, July 2007

Roland Seitre / 'The Hands', one of the patterns of the Nazca Lines. These are lines and patterns made around 300-600 AD by removing stones from the desert floor to expose the ground beneath. Their purpose remains un...

Frederique Olivier / Aerial view of pack ice, Antarctica, March 2011.

Bryan and Cherry Alexander / Tracks left by the the Chilean Traverse, pulled by the Camoplast, to survey the Ellsworth under ice Lake. Antarctica, January 2006.

Bryan and Cherry Alexander / Aerial view of the Amundsen-Scott Research Station, showing the Dome being dismantled and the new building. South Pole, Antarctica, January 2006.

Frederique Olivier / Aerial view of Southern elephant seal (Mirounga leonina) harem on beach, Macquarie Island, Southern Atlantic, Australian Antarctica, November 2007

Bryan and Cherry Alexander / Crevasses in Greenland Icecap showing movement. Northwest Greenland, 1991.

Bryan and Cherry Alexander / Kenamu river flowing through boreal forest shortly before freeze up. Labrador, Canada, 1997.

Tim Laman / Aerial view of power plant just outside Bako National Park on the edge of mangrove forest, Kuching vicinity, Sarawak, Borneo, Malaysia, June 2006

Tim Laman / Aerial view of rivers and mangrove forest. Sarawak Mangrove Reserve, Sarawak, Borneo, Malaysia. June 2006

Shattil & Rozinski / Aerial view of the construction of the Anzalduas International Bridge spanning three miles along a flood plain on the US side of the Mexico / US border, southwest of McAllen, Texas, USA