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I guess it is the amount of garbage produced and that get out to sea from each region. Garbage like plastic and sewage. Mostly sewage.
It could be the amount of fertlizer run-off as well.
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Glen
49 Year member of the Porsche Club of America
1985 911 Carrera; 2017 Macan
1986 El Camino with Fuel Injected 350 Crate Engine
My Motto: I will never be too old to have a happy childhood!
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