Mother Jones' hometown, San Francisco, yesterday became the first U.S. city to ban non-recyclable plastic bags from use in retail stores. Not only do conventional plastic bags take up space in landfills—1,400 tons in San Francisco alone—they also require petroleum for their manufacture. City supervisor Ross Mirkarimi said, "We can't sleepwalk into the future. The end of the era of cheap oil is here."
Bags made from biodegradable materials such as potato starch are actually stronger than plastic bags, but cost more to produce.