Plus, the Bay of Panama is polluted with industrial waste and sewage and is unsafe for swimming.

WSJ: Preparing to Retire in Panama--WSJ House Talk

The prospectus talks of redeveloping the decaying port area, and of at last cleansing Guanabara Bay of sewage and industrial pollution.

ECONOMIST: Brazil and the Olympics

Industrial companies are increasingly outsourcing their water and sewage management to meet rising environmental standards.

ECONOMIST: Water industry

Delhi draws three-quarters of its drinking water from the Yamuna river, into which the city dumps quantities of sewage, almost all of it untreated, to join a cocktail of farm chemicals and industrial effluents, including arsenic.

ECONOMIST: Bursting cities, bust infrastructure