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Review of Plastic vs.Paper Bag LCA Studies Page 3 <br /> IV. FINDINGS <br /> A. Biodgredation/Compostability <br /> While paper and certain plastics may be biodegradable or compostable in specially <br /> designed industrial facilities, evidence indicates that this feature may be of little <br /> value in the effort to reduce waste: <br /> 1. Current research shows that in modern landfills, paper does not degrade or <br /> break down at a substantially faster rate than plastic does. Due to the lack of <br /> water, light, oxygen, and other important elements necessary for the <br /> degradation process to occur, nothing completely degrades in modern landfills. <br /> As evidence of this, here is a photo of a <br /> newspaper buried in an Arizona landfillrxek, <br /> and dug up after more than three decades.As can be clearly seen, paper does not degrade rapidly in landfills. (Photo credit: <br /> Dr. William Rothje, Founder of The Garbage Project at The University of Arizona.) u <br /> Compostable plastics, which are produced from plant-based feedstocks, do not <br /> degrade in landfills, either. According to NatureworksO, a producer of a corn- <br /> based plastic known as PLA, containers made from its material will last as long <br /> in landfills as containers made from traditional plastics.' <br /> 2. In order to breakdown as intended, compostable plastics must be sent to an <br /> industrial or food composting facility, rather than to backyard piles or <br /> municipal composting centers. Since there are apparently fewer than 100 of <br /> these facilities functioning in the entire United States, the economic and <br /> environmental costs of wide-scale plastics composting are prohibitive, <br /> significantly reducing the value of such an alternative.Z <br /> 3. By definition, composting and biodegradation release carbon dioxide (CO2), a <br /> greenhouse gas, into the atmosphere, increasing the potential for climate <br /> change. For example, composted paper produces approximately twice the CO2 <br /> emissions produced by non-composted paper. (See Paragraph B.1. just below <br /> for specific details.) <br /> B. Waste, Energy Consumption, Greenhouse Gas Emissions <br /> The evidence does not support conventional wisdom that paper bags are a more <br /> environmentally sustainable alternative than plastic bays. While this is certainly <br /> counterintuitive for many people, relevant facts include the following: <br /> 1. Plastic bags generate 39% less greenhouse gas emissions than uncomposted <br /> paper bags, and 68% less greenhouse gas emissions than composted paper bags. <br /> The plastic bags generate 4,645 tons of CO2 equivalents per 150 million bags; <br /> while uncomposted paper bags generate 7,621 tons, and composted paper bags <br /> generate 14,558 tons, per 100 million bags produced.' <br /> 28 March 2008 <br />