Environmental activist Deni Riswandani holds up cups of water from the Citarum river, right, and from a tributary which runs through an area densely populated with textile factories, left, where the two meet near Majalaya in Indonesia's West Java province. Darren Whiteside / Reuters
Environmental activist Deni Riswandani holds up cups of water from the Citarum river, right, and from a tributary which runs through an area densely populated with textile factories, left, where the tShow more

Indonesia takes on task of cleaning up 'world's dirtiest river'