If you live in or have even been to S\xe3o Paulo, it is likely that you\u2019ve walked over a waterway without even noticing it. There are between 300 and 500 of them in Brazil\u2019s biggest city, running through pipes extending from 1,500km to 4,000km. And the fate of the city\u2019s main rivers doesn\u2019t have a happy ending. They\u2019ve become ugly and polluted \u2013 not at all fit for a S\xe3o Paulo postcard.
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