Guardian: Customers at the UK’s leading supermarkets used 43% fewer carrier bags in 2009-10 than they did in 2006, when figures were first recorded, with 6.1bn single-use bags used in 2009-10 against 10.7bn four years earlier. According to the Waste & Resources Action Programme (Wrap), the amount of material used to make carrier bags has reduced by 39,700 tonnes per year in the past four years, but figures for May 2010 alone indicate that we may be seeing a return to greater …