Abridged from a BBC report:
The patriarch of Venice, Angelo Cardinal Scola, has urged the city's Catholics to give up bottled water during Lent, and instead to donate the money saved to a water pipeline project in Thailand. He is backed by the mayor, who says he drinks only tap water. Nearly all Italians drink bottled water rather than tap water. The industry is worth an estimated 3.2bn euros (£2.38bn) a year in Italy.
Bottled water harms the environment because of discarded plastic bottles, and also because of greenhouse gas emissions.
Last summer, New York mayor Michael Bloomberg urged his city's residents to drink tap water.