Melting ice will loose highly toxic chemicals

According to an article that ran recently in the San Francisco Chronicle's online publication:

Some of the most dangerous pollutants we know, called persistent organic pollutants, have been frozen in the Arctic tundra and ices caps since they were banned in the U.S. in 1979 and internationally in 2001. But climate change is bringing the return of the repressed, according to a new study in the journal Nature Climate Change.

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