Minnesota and the great lakes have 20% of the worlds fresh water resources. Half of that is contained in lake superior. A lake which has an average temperature of 40 degrees F, which keeps the surrounding area cool in the summer and warmer in the winter. This is a huge positive, but at the same time the largest oil pipeline in the US is running under MN soil. 3m is by far the largest polluter of this state, and ranked in the nation. Not to mention pfoa's and pvc's being found in newborns and even polar bears. They are the leading powdered resin producer. These are all bio-accumulants, which means they do not process through organic systems similarly to asbestos and fiber glass.
(refer : http://www.healthybuilding.net/news/060224pfoa.html
http://news.minnesota.publicradio.org/projects/2005/02/toxictraces/timeline.shtml)
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