Dr Jean Adams, Centre for Diet & Activity Research, University of Cambridge
Since October last year, by law, large retailers in England have been charging customers 5p (€0.06) for ‘single-use plastic carrier bags’ – those flimsy plastic bags you get from supermarkets to carry your groceries home. The money raised is donated by retailers to ‘good causes’. In the first six months of the scheme, plastic bag use by major supermarkets decreased by more than 90% (that’s 7bn fewer bags!) and more than £29m (€32m) was donated to good causes. It’s hard not to conclude that a small financial disincentive can have a big impact on our behaviour.