Idiens brings up the most relevant of facts. Most of the pollution's origin is from the shore. A fact which makes the Dog's original thesis spurious.
Utilizing biodegradable materials at sea is eminently sensible. On shore it is actually counterproductive. Plastic bags take up far less landfill space than do paper bags and neither break down within the landfill. Plastic diapers are even a better idea than cloth as they take up less landfill space and result in far less contamination of ground water supplies than do the cloth via washing.
Hydrocarbons are a naturally occuring phenomena in the ocean. The entire argument becomes facile when biologists are unwilling to say that they have no exact idea of what is truly normal in nature or what nature is able to tolerate. Again, no one is in favor of wanton pollution, but to ignore the fact that nature herself pollutes quite readily and often smacks only of human arrogance and does nothing to advance sensible policies.
“Scientists are people who build the Brooklyn Bridge and then buy it.”
Wm. F. Buckley, Jr.