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Due to their high toxicity, there was a world wide ban on the production of PCBs in 1977. PCBs are extremely stable and difficult to break down, so some are still found in the environment. All PCBs are presumed to be produced by humans, seeing as there is no known natural process that would produce PCBs. So how do PCBs appear in remote Alaskan lakes untouched by humans? The group I was a part of hypothesized that there were companies dumping chemical waste in those lakes, which could include PCBs. To test this hypothesis, we suggested that the lake water be tested daily, and chemicals found be compared with those being produced by companies in a close vicinity to the lake...
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