In this photograph taken on April 26, 2023, people walk along a street next to a sewage canal filled with garbage at Seelampur neighbourhood in New Delhi. Out of the 72 billion litres of sewage currently generated in Indian urban centres every day, 45 billion litres – equal to 18,000 Olympic-sized swimming pools – isn't treated, according to government figures for 2020-21. (Photo by Arun Sankar/AFP Photo)
