In developed countries in Europe and America, most supermarkets have long provided consumers with free plastic bags, and many people who travel abroad have long had experience. But this is not in the form of a government regulation, but many supermarkets consciously do it. People buy their own handbags, and even some people carry large travel bags to go shopping. After filling a large bag of things, they carry home with their big shoulders and their bags are not open. They are environmentally friendly. Some supermarkets even charge you a few euros of plastic for the bottled water. If you can take the empty bottle and exchange it for the bottle you pay, the supermarket uses this method to better ensure waste recycling.
In April 2007, San Francisco became the first city in the world to ban the use of plastic bags in supermarkets and pharmacies, and was the first city to legislate on the matter. The bill stipulates that supermarkets and pharmacies can only provide customers with paper bags, cloth bags or biodegradable plastic bags made from corn by-products. The city of San Francisco uses more than 180 million chemical plastic bags per year. If the city is banned, it is expected to save about 1.7 million liters of crude oil per year and reduce about 1400 tons of garbage.