(IL) Chicago Tribune – Chicago is the only major U.S. city that doesn’t disinfect its sewage, and the agency that treats its wastewater has a new reason for opposing the idea: It’s bad for the environment.

Engineers with the Metropolitan Water Reclamation District of Greater Chicago recently completed an in-house study of its carbon footprint at the request of the elected board of commissioners. Going beyond the assignment, they also decided to look at how the footprint would change if it had to kill bacteria in sewage before pouring it into the Chicago River. More