The UK’s Victorian-era sewer network is at breaking point.
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Thames Water has mapped its discharges in near real time. But we still need data on the volume of sewage dumped in rivers.
These maps have gone viral – here’s what they owe to 19th century cholera campaigns.
Cleaning and reoxygenating the river Thames has helped its biodiversity surge, but there’s still more to be done to make it healthy.
