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By Kim Palmer Cleveland, Ohio (Reuters) - Alarmed over a string of earthquakes linked to deep wells in nearby Youngstown, authorities in Mansfield, Ohio have threatened to block construction of two similar waste disposal wells planned within their city limits. [More]

Late last week, the Department of Health and Human Services classified formaldehyde as "a known carcinogen," adding its verdict to two similar reports released by key agencies since 2009. But despite the growing scientific consensus about how formaldehyde can affect human health, it remains to be seen if the studies will lead to tighter U.S. formaldehyde regulations.