Can Bacteria Actually Eat Plastic?

Bacteria that eat plastic sounds like the fix everyone's been waiting for, and Andrew gets sent videos about it constantly. So on this solo episode, following Monday's interview with Dr. Anja Brandon of Ocean Conservancy, he goes looking for the real state of the science. The short version: it's promising, it's roughly a decade of real research deep, and it is nowhere close to running at the scale the ocean plastic crisis actually needs.

The bacterium that started this whole field, Ideonella sakaiensis, was discovered breaking down PET plastic in Japan in 2016. A 2025 breakthrough from NREL, UMass Lowell, and the University of Portsmouth engineered an improved PET-degrading enzyme that cut chemical use by more than 99%, running costs by 74%, and energy use by 65%, modeling out to a cost that actually undercuts virgin plastic. It's a genuinely exciting result. It's also still lab-stage, with no commercial plant running it yet. Carbios, the French company furthest along at trying to bring enzymatic PET recycling to industrial scale, is proof of just how hard that jump is: its flagship French plant is delayed, its cash reserves have been cut by more than a third, it slashed 40% of its workforce, and it's now pivoting toward a joint venture in China that's faced its own shareholder disputes.

Then there's the other technology people call "plastic-eating," chemical recycling through pyrolysis, which isn't biological at all. It's plastic melted down with extreme heat back into oil and gas, currently handling under 1.3% of US plastic waste according to advocacy group Beyond Plastics, regulated by the EPA as a form of incineration (a classification the agency is actively trying to change as of this year), and excluded from the EU's own definition of recycling entirely. Andrew lays out where the real hope sits, where the hype outruns the evidence, and why reduce, reuse, and refuse still does more for the ocean than any of this, at least for now.

Takeaways:

• The bacterium behind the "plastic-eating bacteria" field, Ideonella sakaiensis, was discovered in Japan in 2016, and the research is real but still roughly a decade from meaningful commercial scale.
• A 2025 enzyme breakthrough from NREL, UMass Lowell, and the University of Portsmouth models out to costs that undercut virgin plastic, but it's a lab and modeling result, not a running commercial plant.
• Carbios, the company furthest along at industrial-scale enzymatic PET recycling, still can't get its flagship French plant operational and is now pivoting toward a contested joint venture in China.
• Chemical recycling (pyrolysis) is a separate, non-biological technology that melts plastic down with heat, currently handles under 1.3% of US plastic waste, and is regulated by the EPA as incineration, a classification the agency is actively trying to change in 2026.
• Advocacy group Beyond Plastics found pyrolysis facility emissions can run 10 to 100 times higher than making virgin plastic, and that multiple US pyrolysis facilities have already shut down or gone bankrupt.
• None of these technologies are close to solving ocean plastic pollution at scale right now; reducing single-use plastics at the source still does more, and that requires government leadership, not just individual habit changes.

Support Independent Podcasts: https://www.speakupforblue.com/patreon

Need help with your ocean non-profit, company, or project? Get the help you need with Pisces Oceans Inc.: https://www.piscesoceans.ca

Connect with Speak Up For Blue
Website: https://bit.ly/3fOF3Wf
Instagram: https://bit.ly/3rIaJSG
TikTok: https://www.tiktok.com/@speakupforblue
Twitter: https://bit.ly/3rHZxpc
YouTube: www.speakupforblue.com/youtube