Plastic pollution feels like a problem with no clean exit. It doesn't rot, it doesn't disappear, it just breaks into smaller and smaller pieces and sticks around for centuries. But nature may be quietly working on a fix of its own: bacteria that can actually break plastic down and use it as food.
The first plastic-eating bacterium was discovered at a Japanese waste dump in 2016. Named Ideonella sakaiensis, it can fully break down PET; the plastic used in bottles and food packaging, into harmless building blocks that it and other organisms can then use as food. Two years later, researchers tweaked that microbe and produced an enzyme that was even better at breaking down plastic bottles.
That discovery kicked off a much bigger hunt. A team at Chalmers University of Technology in Sweden ran the first large-scale global assessment of bacteria's plastic-degrading potential, scanning DNA samples from around the world and finding 30,000 enzymes capable of breaking down 10 different types of plastic - nearly 60% of which had never been seen before. One in four of the organisms analyzed carried at least one of these plastic-degrading enzymes.
The most striking part: the researchers found more of these enzymes in microbes from places with heavier plastic pollution, and the enzyme types matched the plastic types found there, as if the local microbial life was adapting to what was showing up in its environment.
Are they actually evolving to do this?
This is where the story gets more careful. It's tempting to picture microbes rapidly evolving a superpower in response to human trash. But more recent analysis suggests something a little different: plastic-degrading microbes likely aren't evolving this ability because of plastic pollution. Scientists are mostly discovering and repurposing metabolic functions that already existed in nature, and the capacity to break down plastic-like compounds predates plastic itself. This mirrors what's been seen with other pollutants, like oil and pesticides, where microbes already had loosely related tools that happened to transfer to a new food source.
That distinction matters for where scientists look next. It suggests promising microbes might not be limited to landfills and polluted soil. They could turn up almost anywhere.
Because most plastic today is hard to degrade or recycle, these enzymes could open the door to genuinely biodegrading plastic waste and even turning old plastic into new products, cutting demand for virgin plastic. The next step researchers are pursuing is testing the most promising enzymes directly, with an eye toward engineering microbial communities aimed at specific polymer types.
It's not a fix that arrives overnight. But between a bacterium found in a Japanese dump and 30,000 newly catalogued enzymes scattered across the planet's soil and oceans, there's a real, growing toolkit, and it might have been hiding in plain sight the whole time.
