Seven Supermarkets in Britain got together with a plan to reduce the numbers of plastic shopping bags being given out.
And after only one year, 346 million fewer plastic bags per month were being used.
The British Retail Consortium believes consumer behaviour has now changed, helped by supermarkets giving out free re-usable bags and awarding loyalty points to customers who bring their own bags.
Environmentalists say plastic bags take hundreds of years to decompose despite typically being used only once.
Discarded bags blight the landscape and kill small animals and birds that become snared up in them.
Plastic bags also make it into the sea, where they are eaten by turtles and marine mammals, who mistake them for jellyfish.
To the Supermarkets....Asda, Co-Op, Marks & Spencer, Sainsbury's, Somerfield, Tesco and Waitrose... we salute you.