Protesters demonstrate against the Energy Transfer Partners' Dakota Access oil pipeline near the Standing Rock Sioux reservation, in Los Angeles, California, September 13, 2016. REUTERS/Lucy Nicholson

Protesters demonstrate against the Energy Transfer Partners' Dakota Access oil pipeline near the Standing Rock Sioux reservation, in Los Angeles, California, September 13, 2016. REUTERS/Lucy Nicholson

Coal is transported via conveyor belt to the coal-fired Jim Bridger Power Plant that supplied by the neighboring Jim Bridger mine that is owned by energy firm PacifiCorp and the Idaho Power Company, outside Point of the Rocks, Wyoming March 14, 2014. REUTERS/Jim Urquhart/File Photo

Protesters demonstrate against the Energy Transfer Partners' Dakota Access oil pipeline near the Standing Rock Sioux reservation, in Los Angeles, California, September 13, 2016. REUTERS/Lucy Nicholson

Protesters demonstrate against the Energy Transfer Partners' Dakota Access oil pipeline near the Standing Rock Sioux reservation, in Los Angeles, California, September 13, 2016. REUTERS/Lucy Nicholson

The John Amos coal-fired power plant is seen behind a home in Poca, West Virginia May 18, 2014. REUTERS/Robert Galbraith/File Photo

A 100 Yuan note is seen in this illustration picture in Beijing March 7, 2011. REUTERS/David Gray/File Photo

A man scoops a handful of one-yuan coins collected from coin-operated laundry machines, as he shows them to reporters in Zhengzhou, Henan province, China, January 11, 2016. REUTERS/Stringer