4. Japan
We have all heard of incidents of spills but radioactive water spilling into the sea constantly over the course of six years? That’s a big one. Japan’s Fukushima nuclear plant has been dropping radioactive waste into the ocean ever since the tsunami in 2011 when “the largest single contribution of radionuclides to the marine environment” was observed. In fact it was reported in 2016 that the leak will continue for four more years, which is just as worrying for the US as it is for Japan as the contaminated water has reached the shores of America as well.
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