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" ... Some of what we've produced here on Earth isn't merely a problem to be reckoned with over the short-term, but poses a danger that will not significantly lessen with time. Our most dangerous, long-term pollutants include nuclear by-products and waste, hazardous chemicals and biohazards, plastics that off-gas and don't biodegrade, and could wreak havoc on a significant fraction of the living beings on Earth if they got into the environment in the wrong way. ... "