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A section of the 800-mile-long Trans-Alaska Pipeline System (TAPS). The Trans-Alaska oil pipeline (also known as the Alyeska Pipeline) has transported over 15 billion barrels of oil since it was established in 1977. The line stretches between the oil fields at Prudhoe Bay on Alaska's North Slope to Valdez, the northernmost ice-free port in North America. Photo: Dermot Tatlow/Panos Pictures/Felix Features