You do not need to purchase a new greeny bag to show to everyone that you'll giving a helping hand to the mother earth. All you need to do is reuse your bag and taking care of your wastage.
An unpublished report from the UK's Environment Agency found that when compared to a traditional plastic bag, a canvas or cotton reusable bag would have to be reused a total of 171 times to offset the higher carbon emissions. The same study found however that the average cotton bag is used only 51 times before being thrown away. So, you'll need to reuse it at least 4 times more than the study shown!
So, just bear in mind when you want to throw the bag away.
;)
