At the Highlands Acid Pit on Thursday, August 31, 2017, the No Trespassing sign on the barbed-wire fence encircling the 3.3-acre Superfund site barely peeked above the churning flood water from the nearby San Jacinto River. Long a center of the nation's petrochemical industry, the Houston metro area has more than a dozen such Superfund sites, designated by the Environmental Protection Agency as being among the most intensely contaminated places in the nation. (AP Photo/Jason Dearen)
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