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Indian fishermen push their boat through plastic waste into the sea in Mumbai on January 21, 2015. India is part of a global trend that is advancing towards an increasing urbanisation, with more than half of the world's population living in towns and cities. AFP PHOTO / PUNIT PARANJPE (Photo credit should read PUNIT PARANJPE/AFP/Getty Images)

Indian fishermen push their boat through plastic waste into the sea in Mumbai on January 21, 2015. India is part of a global trend that is advancing towards an increasing urbanisation, with more than half of the world's population living in towns and cities.   AFP PHOTO / PUNIT PARANJPE        (Photo credit should read PUNIT PARANJPE/AFP/Getty Images)