New Trend: Bioplastics
Concerns about the rising price and supply limits of petroleum, as well as environmental factors, have spurred the use and development of bioplastics synthesized from corn, soy, sugar cane, and other crops. Toyota has started using bioplastics in some of its cars; Wild Oats, Newman’s Own, and Del Monte have adopted them for deli and food packages; and even Wal-Mart has begun using a corn based packaging for cut fruit and vegetables. Most of the bioplastic packaging used in the US is polymerized lactic acid (PLA) made by NatureWorks LLC, a company owned by Cargill.
Bioplastic's Benefits: Unlike conventional plastics, bioplastics biodegrade relatively quickly under the right conditions, and they’re made from annually renewable crops rather than petroleum. PLA can also be recycled into more of the same product repeatedly, while plastic can’t.
Early reports suggest that bioplastic can be an effective substitute for petroleum-based plastic. Last July, the Los Angeles Times published an article about Cargill’s Nebraska facility that manufactures PLA from corn. “The end products—which include T-shirts, forks and coffins—look, feel and perform like traditional polyester and plastic made from a petroleum base,” the article reports. “But the manufacturing process consumes 50 percent less fossil fuel, even after accounting for the fuel needed to plant and harvest the corn.”
Concerns: Since relatively few people in the US have access to commercial or industrial composters, which help bioplastics degrade, lots of bioplastic is ending up in landfills or recycling bins. In landfills, PLA will lack the light and heat it needs to degrade. Plastic recycling is unlikely to be adversely affected by PLA, which can’t currently be processed by mainstream recyclers, until it makes up a far greater percentage of plastic than it does now. The best option would be to develop a separate recycling stream for PLA.
The Sustainable Energy & Environmental Demand (SEED) Initiative of the organization Future 500 brings together NGOs, corporations, and governments to develop markets for emerging technologies that will reduce petroleum dependence. SEED is helping NatureWorks and environmental groups work together to make PLA as eco-friendly as possible. Issues include the large amounts of energy and chemicals used to grow and process the corn, the use of GMO corn, and waste disposal. NatureWorks has already taken positive steps in these areas by purchasing green-power offsets, offering customers options to buy non-GMO-corn offsets or GMO-free PLA, and buying baled PLA back from recyclers. They continue to work with stakeholders through SEED.
One danger of increased bioplastic use is that people might end up buying a lot of it if they think it’s less problematic than petroleum-based alternatives. A shift to bioplastics still needs to be accompanied by waste reduction.