Image credit: Hemera/Thinkstock

Every year, sockeye salmon return to the rivers of western Canada to make their arduous upstream journey to calmer spawning grounds. It is a seasonal touchstone that signifies the approaching end of summer, one that has been observed for centuries.

The only problem is that some years, like in 2009, the salmon don’t return…. Read the full story on TreeHugger
Credits to:TreeHugger

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