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Bear in mind that it's not all that long ago that fertilizing with sewage sludge was seen as the environmentally friendly approach, and was even allowed in organic foods. Things have actually come a long way since I was told that by my friend who worked for a Canadian health food distributor, and visited sites to determine whether or not to carry certain product lines. And it's only recently that research has shown that much more was absorbed by plants than was thought to be the case decades ago, when it was generally accepted that plant roots filtered out all the bad stuff ...