Business Green: Tesco has been accused of releasing figures which could give the misleading impression that it met an industry target to halve its use of plastic bags. Seven supermarket chains — Tesco, Asda, Sainsbury’s, Co-op, Marks & Spencer, Somerfield and Waitrose — signed an agreement last year committing them to reducing the number of bags by 50 per cent over the three years to May 2009. This month the supermarkets collectively reported, via figures released through recycling …