A worker collects garbage from the Marilao River in Bulacan, north of Manila, on March 18, 2017. Pure Earth, formerly known as the Blacksmith Institute, a non-governmental organisation that works to solve pollution problems in the developing world, named Marilao River as one of the 30 dirtiest places in the world in 2007. (Photo by Noel Celis/AFP Photo)
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