A floating buoy marks the edge of the shipping channel on the Mississippi River south of St. Louis. Barges carrying grain, soybeans, coal, oil and other commodities on the Mississippi River have started to reduce their loads to navigate waters shrunk by the worst drought in 50 years, posing new challenges for the Army Corps of Engineers. (Bloomberg News photo by Daniel Acker)
Read the article: Climate change pits Sioux tribe against barges
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