Plastic bags are made from polyethylene, which comes from petroleum, a nonrenewable resource.They are ubiquitous. Between 500 billion and a trillion plastic bags are consumed worldwide each year, according to the United States Environmental Protection Agency.However, less than 1 percent of the bags are recycled because it costs more to recycle a bag than to produce a new one. It costs $4,000 to process and recycle a ton of plastic bags, which can then be sold for $32.If the economics don’t work, recycling efforts don’t work.Cloth bagWe can save...