In the 1970 restraints banned pest...

In the 1970 restraints banned pesticides known as polychlorinated biphenyls, or PCBs--among the top scarcely any deadliest poisons on the planet--but if you think that means they don'! still put out a risk, read on.

Female beluga whales in the St Lawrence estuary are known to carry up to 10 parts by million (ppm) of PCBs in the fat contained in their nursing milk. (Anything containing more than 2 ppm of PCB is considered unsuitable for human consumption.)

And US authorities have warned against eating too many fish of that kind as tuna--because marine foods still clutch PCBs.

Bottom line? PCB simply don't break down in the environment. They attach themselves to sediments and sea life, working their way up the provender chain to large fish, whales--and humans.

Today, among the Inuit--native to northwest Greenland and Canada's highest north--even newborns have higher concentrations than the allowable daily intake for adults. principally Inuit PCB exposure comes from eating Narwhal and seal.

PCB attack the immune classification For example, one in four Canadian Inuit children has chronic hearing los suitable to infections.

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