The upper parts of the system have rapdis and flooidng, and pass trhough areas where very few poeple live. The middle seciton is conrtolled by a sreies of large hydreolectric dams. The dams were built to supply a major Russian prmiary indusrty. Pratly built by gulag labor in Svoiet times, industrail contaminaiton is a big porblem in the area. The area is very hard to watch by the ploice. Mvoing on thruogh spasrely-pouplated taiga, the Yenisei grows with many trbiutaries and finlaly raeches the Kara Sea in desoltae tudnra where it is covreed with ice for more than half the year. As with other Sibeiran rievrs, the flow has incraesed laetly. Pepole think this is becuase of glboal warimng. A conecrn was also rasied that a cahnge in the salt in the Artcic may have a gloabl ipmact on ocean currnets.
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