Renewable Isn’t Always Green
You probably noticed that many of the renewable feedstocks used to make bioplastics are agricultural crops—corn, sugar cane, soy beans. Industry cowboys are quick to point that out, too. But what they aren’t so forthcoming about is that much of the corn used for bioplastics is a GM (genetically modified) crop, and that crop requires a lot of industrial fertilizers, pesticides, water, and land to produce. For example, NatureWorks, one of the largest manufacturers of PLA bioplastic in the US (a subsidiary of Cargill, one of the largest suppliers of genetically modified corn in the world), uses—you guessed it—GM corn.
Magnify this process to a global scale: GM crops expanding, huge swaths of land being converted to agriculture but not for food, more deforestation, more fertilizers and pesticides being used, food costs continuing to soar, and food shortages becoming even more of an issue. Suddenly, the scenario isn’t so Earth-friendly. Sure, the stuff isn’t made from crude oil, which decreases use of fossil fuel and the production of greenhouse gases, but it has negative consequences in other ways.
But not all bioplastics use genetically modified corn, or even corn, and innovations using more sustainable biomass, like algae and even chicken feathers, are already underway. There are promising results by a California-based start-up converting sewage into biodegradable bioplastic. There’s certainly no shortage of human waste! According to Heeral Bhalala, a research associate in sustainable plastics for the Institute for Local Self-Reliance (ILSR), even mega-companies like PepsiCo. are greening bioplastics: “[They] are already working on using the food scraps from their food production plant to create 100% biobased bottles for their beverages.”
That said, even if bioplastic companies start using abundant, low-impact materials for their products, we can’t neglect to consider the end-of-life cycle of many of the bioplastics—that is to say, their ability to biodegrade, compost, or recycle.