This Feb. 9, 2016, photo shows ice forming on pipelines built near the Colville-Delta 5, or as it's more commonly known, CD5, drilling site on Alaska's North Slope. ConocoPhillips in October 2015 became the first to drill for oil in the National Petroleum Reserve-Alaska, a region the size of Indiana set aside by President Warren G. Harding in 1923.  (AP Photo/Mark Thiessen)
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