The SEC, he said, has often updated its assessment of what constitutes material risk for investors, beginning with new environmental criteria following the Love Canal toxic dump scandal of the late 1970s.

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Taxpayers living next to a toxic waste dump is a bad idea.

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Last week an American firm whose plans to build a toxic waste dump had been blocked used chapter 11 to win damages from Mexico.

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Wireless lately has all the appeal of a toxic waste dump.

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That is true in an obvious sense when, for example, companies dump toxic waste or use risky technologies in countries whose regulation is relatively lax.

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They have seen the imposition of any measures designed to slow economic activity rather as they might look at a toxic-waste dump: vital for the greater good, to be sure, but better in someone else's backyard.

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Dense smoke laden with toxic dust from rubbish burnt at the dump billows for miles around.

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But in some areas, sediments are so polluted with toxic chemicals, such as mercury, that the mud must be stored in a dump.

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