Children collect rubbish on the river Buriganga in Dhaka May 17, 2009. It was once the lifeline of the Bangladeshi capital. But the once mighty Buriganga river, which flows by Dhaka, is now one of the most polluted rivers in Bangladesh because of rampant dumping of industrial and human waste. To match feature BANGLADESH-RIVERS/ Picture taken May 17, 2009. REUTERS/Andrew Biraj (BANGLADESH ENVIRONMENT SOCIETY)