How Long Does it Really Take Plastic to Decompose?

How long Does it really take plastic to decompose?!

For 20 years I have avoided this question because I knew the answer would destroy my favourite post kayaking tradition - eating 100lbs of hand cut fries covered in squeeky Quebec cheese curds and smothered in thick, dark gravy.  If you’re not familiar, this French Canadian delicacy is known as Poutine.

And it’s amazing.

And the absolute best Poutine is found at roadside chip trucks that serve said poutine in a plastic styrofoam container, with a plastic lid, in a plastic bag with a plastic fork and disposable napkin.

And when you’ve spent the 5 whole minutes it takes to eat this God given treat, the container, lid, bag and fork end up in an overflowing garbage can where it will be trucked to a landfill  - not a recycling plant - and sit and sit and sit for 100 years, 1,000 years… forever?

So you can understand why I didn’t really want to know how long it takes plastic to biodegrade because the truth would render this joyful activity a little less so - until... I couldn’t really avoid it (check out our story for more on my ‘awakening’).

But I figured if I could face the truth about plastic, you could too.

And here’s the thing - decomposition, compostability, biodegradability - is largely dependent on microbes, tiny organisms that are invisible to the naked eye.  Despite their teenie size, these guys play an enormous role in cleaning up our planet, but because plastic is made up of compounds that don’t naturally occur in nature, microbes turn their nose up at plastic, they simply won’t eat it.   

Plastic does not decompose... ever!

Which means, according to Popular Science, plastic does not decompose, biodegrade or compost, rather it just breaks down into smaller and smaller plastic pieces.

"Plastics don't biodegrade like organic matter, which means they can't be converted by living organisms into useful compounds for life. Instead, they photodegrade, a process by which photons from the sun's rays pulverize the plastic polymers until they are broken into individual molecules." (Popular Science)

And this is why there are huge masses of plastic floating around our Oceans (some Scientists like Ellen MacArthur even believe that by 2050 there will be more plastic in our oceans than fish) and lakes, clogging our landfills and even leaching toxins into our water table.

Great, so microbes can’t eat plastic, therefore plastic is bad, right?


Ish you say?  What’s this ish… please explain.  

Well, you see, plastic’s inability to biodegrade is definitely problematic, but just how problematic depends on its use - and reuse - because the term plastic refers to everything from the steering wheel of your car to the grocery bag you used to drag home those delicious organic berries (and that 10 pound sack of cheesies).

In fact, some would argue that the plastic used in car manufacturing actually provides a net benefit to the environment because it is lighter than steel and makes cars more fuel efficient and therefore burns less fossil fuels.

Grocery bags, plastic wrap, sandwich bags, ziplock bags and produce bags are more troubling because they are typically used once - maybe twice - and then discarded, where - as previously established - they will wind up in a landfill or somewhere out in the wilderness where they will never biodegrade.  

And this begs the question that we - the consumers - must face.  Is the ease of use of plastics like grocery bags, styrofoam containers or disposable forks really worth the cost?  

Now you know that those single use plastics cannot decompose, what are you going to do about it?

While you're here, check out our Plastic Free Club and join a like-minded community that helps our team and other members to do more to go plastic free?

Newer Post →


  • Consumers have a voice. Ask your poutine truck owner/operator to use paper boats and wooden forks …. and don’t buy the poutine then or again until the packaging is changed. Don’t buy it, tell the producer …. don’t buy it, tell the producer … repeat.

    Suzanne on
  • Forget the anaerobic environment of landfills. In the oceans and their shorelines, many plastics DO DEGRADE and that is worse than not. It’s called: plastic photo-degradation – With prolonged exposure to sunlight, the ultraviolet causes a photochemical effect within the structure degrading the long chain polymer molecules. Combined with known bacteria that do feed on petrochemical polymers, the ultimate results are micro particles coated with biochemicals that are ingested by many marine organisms.

    Philip M Fortman on
  • This is a great article! It helped me a lot with my herbology class.

    Hermione Granger on
  • I too am interested in what LeAnne Tomera asked: how do we responsibly rid our households of the plastics we currently have?

    And for the items that are deemed recyclable – what happens now that China seems to not be so interested in taking our bundles to recyclables. Big question I know. But Q one above – would love your advice. Thanks.

    Gretchen on
  • Three questions: How do we responsibly clean out the plastic that isn’t recyclable in our kitchens? What is being done to stop production of one use plastics? Why aren’t gas stations and fast food restaurants required to have recycling for its customers?

    LeAnne Tomera on

Leave a comment

Please note, comments must be approved before they are published