Plastic bag use is a large contributor to a number of environmental problems. Over 1 trillion plastic bags are used each year worldwide, representing a staggering 13% of municipal solid waste. In addition to using unnecessary resources such as 12 million barrels of oil each year to manufacture just the bags used in the U.S., plastic bags are also a highly visible and ugly component of litter, ultimately creating vortexes miles wide in the ocean, threatening sea birds and other animals. Be a part of the solution. Remember your reusable shopping bag.