I fish a particular park on the Clackamas a lot which always has a lot of garbage present. One time, I came back to my truck and this grungy-lookin' non-fishing guy was picking up trash. I said "Thanks for doing that" He responded "I live here. If I don't pick it up, who will? Comes from all the teeny-boppers who come here to drink at night." Ever since that encounter, I try to pick up something on my way out .
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If every fisherman would pick up one piece of trash, we'd have cleaner rivers and more access.