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Invisible threats mark Earth Day at 40 - Environment- msnbc.com 
Pollution before the first Earth Day was in your face: Cleveland's Cuyahoga River caught fire. The challenges to today are largely invisible — and therefore tougher to tackle.
http://www.msnbc.msn.com/id/36695138/ns/us_news-environ
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first added by morganmmnm, last updated 2 years 1 months ago
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