July 1, 2008 - ...of plastic bags will be banned at all supermarkets and retail stores in Los Angeles beginning Jan. 1, 2012 if a bag fee has not yet been established, said the committee.Consumers in the city of Los Angeles use 2.3 billion plastic bags a year. For the average retailer, plastic bags cost 2 cents to 5 cents, compared to biodegradable plastic bags that can cost 8 cents to 17 cents.The negative consequences of plastic bags and polystyrene containers are "increased waste to landfills,...