Solutions? Bio Plastics, Plastic Recycling, Circular Supply Chains, Using Less … great article by #LaurieParkerby gearedforgreen June 10, 2018 cardboard boxes circular supply chain decoating technology eco apparel eco brand marketing eco supply chain Exxon gearedforgreen packaging plastic plastic raw materials plastic recycling plastic resins Proctor & Gamble recycling social partnerships sustainable packaging sustainableshopping
IN A WORLD THAT CAN SEEM overwhelmed by potentially eternal plastic waste, are biodegradables the ultimate solution? Probably not. But it’s complicated. The industry is still debating what “biodegradable” actually means. And some plastics made of fossil fuels will biodegrade, while some plant-based “bioplastics” won’t.
Biodegradable plastics have been around since the late 1980s. They initially were marketed with the implied promise that they’d somehow disappear once they were disposed of, just as leaves on the forest floor are decomposed by fungi and soil microbes. It hasn’t quite worked out that way.
Biodegradables don’t live up to their promise, for example, in the dark, oxygen-free environment of a commercial landfill or in the cool waters of the ocean, if they should end up there. You can’t throw them in your backyard compost either. To break down, they require the 130-degree heat of an industrial composter. Many industrial composters accept only plastics that meet certain standards, ensuring they will leave no fragments behind that can harm the environment or human health. And if you throw some biodegradables in with recyclables, you might ruin the latter, creating a mix that can no longer be relied on to make durable new plastic. In 2015 the United Nations Environment Program wrote off biodegradables as an unrealistic solution that will neither reduce the amount of plastic flowing into the oceans nor prevent potential chemical or physical harm to marine life. It concluded that the label “biodegradable” may actually encourage littering.
Some engineers are looking for ways around these obstacles. Jenna Jambeck and her colleagues at the University of Georgia’s New Materials Institute are using polymers synthesized by microbes to make packaging they hope will compost readily and biodegrade in the ocean. Corn chip bags are their first target.
It’s a tall order. Even the best biodegradable product won’t magically disappear. A plastic container robust enough to carry a gallon of milk can’t decompose like paper. A flowerpot, one of Polymateria’s experimental products, could take up to two years to dissolve if tossed in a ditch, Dunne concedes. Biodegradables, some critics say, don’t address the fundamental problem: our throwaway culture.
“What is it that we are promoting?” asks Ramani Narayan, a Michigan State University chemical engineering professor. “Throw it away, and eventually it will go away?” The more responsible approach, he says, is a “circular economy” model, in which everything is reused or recycled and “any ‘leakage’ into the environment, whether biodegradable or not, is not acceptable.”
China is providing motivation. For nearly three decades it has bought about half the world’s recyclable plastic. But this year it called a halt to most scrap imports. Recyclables are now piling up in the countries that generated them. “We hope it will push towards more circular management.”
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