New Scotland Yard
New Scotland Yard may be a beacon of law and order in the heart of London, but the sight of its lights burning through the night has taken on a different meaning. Staff at the HQ of the Metropolitan Police use so much lighting, heating, cooling and electricity that the tower pumps out 13,491 tonnes of carbon dioxide a year – equivalent to about 2,200 households. It makes it the most polluting police station in England and Wales and one of the biggest contributors to greenhouse gases of any public building in Britain.