The World's Dirtiest Playgrounds

A boy rides a bike in a Romany settlement in Sarajevo's suburb of Butmir, Bosnia-Herzegovina.

Children play on foam from a polluted river at the Marunda flood canal in Jakarta, Indonesia.

A boy plays with a tire near garbage being set on fire by residents of a slum in Karachi, Pakistan.

Luciano Montero (left) and Samuel Nunez play among piles of rubbish heaped outside homes in the city of Santa Fe, 480 kilometers north of Buenos Aires, Argentina.

Sana, 5, plays on a cloth sling hanging from a telephone pole as smoke from a garbage dump rises next to a railway track in Mumbai, India.

Boys play by a puddle near their shelter in Kabul.

Boys spin tops in front of a coal-powered electricity plant in Xilinhot, Inner Mongolia, China.

A child swims in the litter-strewn waters of Cilincing Beach in Jakarta, Indonesia.

A Bangladeshi boy jumps on waste products that are used to make poultry feed as she plays in a tannery in Dhaka.

Children play in a slum area of Karachi, Pakistan.

A boy plays in a garbage dump where hundreds of people live and earn money by recycling waste and making charcoal in Manila, the Philippines.