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Rivers Have Been Known To Divert Due To Geologic Events, Like Major Fluctuations (Warm To Cold) In Climate. These Fluctuations Tend To Happen Within Spaces Of 100s-1000s Of Years. But Human Induced Global Warning Has Made It Possible For Scientists To Witness A River Being Redirected/Pirated In One Spring.

Slims River: Climate change causes "river piracy" in Canada's Yukon – BBC News

http://www.bbc.com/news/world-us-canada-39634290

When a team of scientists went to the Yukon to study the Slims River, all they found was a “skinny lake”.