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The Trans Alaska Oil Pipeline running on refridgerated support to stop oil heat melting the permafrost,Mount Hayes (4116m) and the Alaska Range in the background, Alaska, USA

Trans Alaska oil pipeline across taiga through Alaskan Range carried on insulated ground piles, Alaska, USA

The Trans Alaska Oil Pipeline running on refrigerated support to stop oil heat melting the permafrost, Alaska, United States of America, North America

South of Delta Junction, Alaska. The supports are filled with anhydrous ammonia. In winter when temperatures drop below about minus 10C the ammonia above the ground turns to liquid and draws the heat from the ground and condenses.

South of Delta Junction, Alaska. The supports are filled with anhydrous ammonia. In winter when temperatures drop below about minus 10C the ammonia above the ground turns to liquid and draws the heat from the ground and condenses.

Three caribou (Rangifer tarandus) walk by oil storage tanks near Prudhoe Bay and the Point Lonely Short Range Radar Site, where the Central Arctic herd migrates north each summer, Alaska, United States of America

Trans-Alaska Pipeline Through Brooks Range Out To The Noatak River, Arctic Alaska In Summertime, Alaska, United States Of America