Reverse vending machines that exchange plastic bottles for money are proving to be incredibly effective in encouraging Britons to recycle. The machines, introduced last year at five UK sites, reward consumers with a voucher worth 10p for every deposit of a bottle purchased at the shops. Since the scheme started, more than £30,000 was rewarded to shoppers in return for plastic bottles. This is an impressive case showing that with the right incentives citizens can be encouraged to engage in environment-friendly deeds.