Sorry, but you misunderstand the situation. Firstly, plastic bags are not "recycled" - they are re-used in a technical definition, a lower step in the waste hierarchy and thus less preferred. It is a finite resource being wasted, compared to genuine recycling (laymen's term: reusing your bag). The sainsburys bags are 33% reused (technical definition), thus far from being sustainable, that's the problem with polymers, difficult to reuse.
Unfortunately you can't argue that, hence why the landfill directive exists, new landfill taxes and the year on year increase and the absolute lack of volume left in landfill, it simply doesn't exist anymore. Your biodegrading plastic bags adds nothing to calorific values in a waste-to-energy system.
Government has quite rightly said, self-reg or we will reg you. Asda are doing the right thing for the world.
I have been in asdas at night and main lighting is turned off for energy saving. Again, revolving doors lower convective heat transfer and are of benefit.
The major place that supermarkets could improve is the refrigeration systems. They are very inefficient due to the boundary defined, cooling and heating itself constantly, with AC cooling the shop.
Personally I am happy to recycle bags (technical definition) and don't see the problem.
Chiptivo:
Yes, I thought of that today.. If they would not let me have the "Free under the counter bags" I may of considered leaving the sale and walking out.
I would of been embarrased if a assistant or manager came along and paid for the 5p ones for me, but it is the point...
Sainsbury's carrier bags are made from recycled plastic, and biodegrade within a couple of years..
Landfill is interesting also, I could argue that landfill is not a bad conpromise for our waste. Our local landfill is now a very nice nature reserve, and also provides methane gas for our local cake and biscuit factory.. A win win situation.
Found a quote from asda managment today "We want to make protecting the planet easier and more affordable for our 15m customers."????
With revolving doors, and stadium floodlighting in the stores.