Scientists say they still don’t know how to protect the Colorado River in the Grand Canyon without disrupting water and power production upstream.

Despite a decade of trying, few attempts have succeeded in trying to mimic the natural conditions erased by construction of Glen Canyon Dam, which supplies water and electricity to millions of people.

Endangered fish continue to disappear, habitat erodes almost as fast as it is rebuilt and interloping fish and plants find new ways to thrive.

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