I agree, they just want the money they say it goes to the Woodland Trust , they are not solving the problem, they don't however, have a recycling system there they leave that to Tesco's, they are just happy to sell you the bag,and don't care what you do with it after. also I paid 1p for a bag in WH Smiths I asked if I could bring it back for a refund, they said no!
Also If an assistant asks if I a want a bag I reply, Do you want the money? (for the goods)
In boots I was made to feel like a criminal because I said I wanted a bag, maybe we should just walk out with the goods in our hands, that would confuse security!