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Oh, i see. By hoax i thought he meant that there wasn't any green river in reality... as in fake video. I could have looked into this more deeply as i always do... but i'm caught up in others stuff....

But you wrote "hoax". I didn't put much time into researching this so i don't really know... but someone posted that link and after reading i posted here.

http://news.nationalpost.com/2010/12/31/green-chemical-in-b-c-river-not-toxic-study-confirms/