Once upon a time, in almost every industrial city, countless rivers flowed. We built houses along their banks. Our roads hugged their curves. And their currents fed our mills and factories. ... Read allOnce upon a time, in almost every industrial city, countless rivers flowed. We built houses along their banks. Our roads hugged their curves. And their currents fed our mills and factories. But as cities grew, we polluted rivers so much that they became conduits for deadly waterb... Read allOnce upon a time, in almost every industrial city, countless rivers flowed. We built houses along their banks. Our roads hugged their curves. And their currents fed our mills and factories. But as cities grew, we polluted rivers so much that they became conduits for deadly waterborne diseases like cholera, which was 19th century's version of the Black Plague. Our solu... Read all
