500,000 plastic carrier bags can be transported on one lorry, only 50,000 paper carrier bags can be transported on the same size lorry, so if everyone used paper instead of plastic then 10x's as many lorries would be needed to transport the bags!!
I am told also that the energy consumption to make a plastic bag is less than that to make a paper bag but have not been able to confirm that yet.
most plastic carrier bags now will decompose in landfill within a year or 2 and make up around 0.3% of volume of a landfill. plastic carrier bags can be recycled with ease now too and have a recycle life of around 10 goes whereas paper has a max recycle life of 3 goes but a wet paper carrier is often binned or unless it is coated in wax which many are, the paper will tear if wet. wax paper bags are not recyclable.
all the big supermarkets recycle. I worked for sainsburys 20 years ago and they recycled then. there are containers for paper and cardboard, and several different containers for the different types of plastic so if you leave your plastic wrappers behind, they should be recycled en masse.
BUT, it is still best to buy locally if you can, I have just found a local farm shop that has seasonal veg and other stuff too and at reasonable prices, but as he is 7 miles away, I wait till both my sisters and mum need supplies and then we go together otherwise all the separate driving would negate the effects.
what is needed is the EU minimum packaging laws to be enacted and enforced. several years ago the EU drew up plans to require manufacturers to use the minimum of packaging but food was going to be exempted for now. but it seems that the laws were watered down. some of the biggest packaging suppliers are in germany and they stood to loose out, make your own mind up as to where I am going with this
recycling is good and necessary, but stopping the excess packaging at source would be the most environmetally way to go