The Stella Luna Gelato Café in our neighbourhood has a sign displayed by the cash register stating that the small, colourful plastic spoons they give out with cups of gelato are biodegradable. And further down the street, the Bridgehead offers salads in compostable plastic clamshell containers — made from corn starch!
Biodegradable spoons ... Compostable clamshell containers ... Are we seeing the emergence of “green” plastic? Can all of us plastic activists relax and dip into our gelatos without compunction?
But what do all these labels actually mean — or, more precisely, what don’t they mean? Here are some facts to help you navigate the terminology.
BIOPLASTICS:
“Bioplastics are just plastics made from plants.” They are derived from things like corn starch or potato starch, corn husks, or soy protein. Sounds nice and green, doesn’t it?
But it isn't quite so simple. The building blocks for making plastic are atoms of carbon and hydrogen, which you can get from oil, gas, or, in the case of bioplastics, from plant materials. But many chemicals are added in the process of “plasticizing” any of these, and as a result, plastics often contain a variety of toxic additives (such as BPA, phthlalates and other carcinogens). The label "bioplastic" doesn’t tell us what else is in the plastic, or even whether it is biodegradable. As the Plastic Pollution Coalition warns — “You could make non-biodegradable and toxic plastic out of organic corn!”
So, if you see the label “bioplastic,” it really tells you nothing about the plastic product’s environmental impact at all.
BIODEGRADABLE:
“Biodegradable” simply means the plastic will break down or disintegrate into carbon dioxide, water, and its other component parts (“inorganic compounds and biomass”) — no matter what the other parts may be, how long it takes, and what the conditions have to be for it to happen. Biodegradable plastics can be made of either plant or petroleum products, and, like all other plastics, they contain many other undisclosed chemicals, some of which may be toxic and harmful to the environment and human health.
So, if you see the label “biodegradable,” it really tells you nothing about the possible toxicity of the plastic's component parts.
COMPOSTABLE:
According to the American Society for Testing and Materials (ASTM), in order for plastic to be labelled “compostable” it has to biodegrade within certain time and temperature limits within a "compost site of an available program" and not leave any toxic residue. Compostable plastics are usually bioplastics, but you can now also find them made from petroleum and petroleum by products. These must all decompose back into carbon dioxide, water, and “biomass” and the resulting compost must meet the criteria for eco-toxicity and support plant growth.
Sounds good, right?
But — and it's a big but — it seems you have no way of knowing if the product has followed ASTM standards unless it is certified by BPI (Biodegradable Products Institute). There are currently no legislated regulations with regard to compostable plastic standards. If no BPI label is visible, the consumer looking at a plastic thing that is simply labelled “compostable” has no way of knowing whether the ASTM standards have been or haven’t been met.
So, if you see the labels “compostable” and BPI certified together, they tell you that the plastic is biodegradable and nontoxic (to certain scientific standards); but if you see the label “compostable” alone, it only really tells you that the plastic might be these things.
However — and this is the kicker — Nothing biodegrades or composts if it goes into a landfill. Landfills are not designed to promote decompostion. Because of lack of oxygen and moisture, as BPI tells us, “trash entering landfills essentially retains its original weight, volume and form for the entire active life of the landfill.”
The only way to compost “compostable” plastic (apart from at home in your backyard composter over a very, very long period of time) is through a commercial composting facility, which Ottawa currently doesn’t have. The City of Ottawa does not accept any kind of plastic, compostable or not, in the green bin program.
What this all boils down to is that your compostable plastic spoon — no matter how certified it is — becomes plain old garbage when you throw it away. It goes straight to the landfill, where it will not biodegrade but remain a plastic spoon until the end of time.
Okay, okay, you say, so what if tomorrow the City of Ottawa acquired the facilities to process compostable plastics? Would a plastic spoon made from a non-food plant source that was totally compostable, biodegradable, free of toxins during manufacturing, and manufactured and composted in a sustainable way be the answer?
In fact, it wouldn’t. In the end, we would still have to ask ourselves, "Do I really need to use this piece of plastic for ten minutes and then throw it away?" The hard truth is that “everything we consume comes from the natural world — it is extracted, mined, farmed, grown, fished, cut down — and the resources on this planet are limited” (Worldcentric). If I can choose between using 1 stainless steel spoon for my remaining years (with a little effort) or thousands of disposable spoons (with no effort), I would choose the first option.
PPC succintly sums it up: “With almost 7 billion people in the planet, a throwaway culture addicted to disposable plastics is likely to continue harming our environment, whether these are made out of oil, or of plants. We believe that rethinking our habits and our uses of plastic is as important as rethinking the material itself.”
Bring a spoon with you to eat your gelato. Or ask for a real spoon — which, I am happy to say, Stella Luna is pleased to offer to their eat-in patrons. Or choose a cone and avoid the packaging entirely!