Morrisons is opening a superstore that monitors how much customers breathe, to save electricity. The store in Kidderminster, Worcs, is fitted with carbon dioxide sensors that set off cold air fans when it is full of shoppers. At quiet times, the fans switch off, saving energy. A Morrisons spokesman said: “It’ll ensure we use the right amount of energy. That’s good for the environment, so it’s a win-win.” The shop, opening Monday, also has solar panels and collects rain for its toilets.