Bento Rodrigues is a subdistrict of Mariana in Brazil which was flattened by a burst tailings dam part owned by BHP. Courtesy: 4 Corners/ABC Devastation after the dam burst in the village of Bento Rodrigues near Mariana last November. Picture: AFP/Christophe Simon IT was Brazil’s worst ever environmental disaster and killed 19 people, but a 10-month...