Today's Evening Standard claims coffee chain Starbucks wastes 23 million litres of water a day through its policy of leaving taps running to avoid staff passing on germs by turning them on and off.
Starbucks executives will find all sorts of useful information in our Green Month channel about saving natural resources - though I must admit it never occurred to us to include "don't run taps all day across your 10,000-strong chain" in any of our 'top tips' list.