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Published July 25, 2013, 12:00 AM

Fertilizer plant


This June 6, 2013 photo shows the Koch Nitrogen Company in Enid, Okla. The company plans to add a new fertilizer production plant at this facility, part of a wave of new fertilizer plant construction and expansion being proposed across the United States. Newly abundant supplies of natural gas, a key fertilizer component, are behind plans that promise to bring jobs to mostly rural locations around the country. But they come as a deadly explosion at a fertilizer plant in Texas highlighted how dangerous some of the chemicals used to make fertilizer can be, and how inconsistently they?re regulated. (AP Photo/Sue Ogrocki)