FILE - In this Oct. 13, 2016, file photo, a cow skull is wired to a fence post in front of a hamlet destroyed by a mudslide triggered by the Nov. 5, 2015 failing of a dam holding back a giant pond of mine waste in Paracatu, Brazil. The UN environment program says a string of mining waste disasters — some deadly — over the past decade show better protections are needed for communities downstream of massive polluted material storage sites. (AP Photo/Leo Correa, file)
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