The planet is teeming with invisible microbes that constantly consume everything around us. However, plastics, a widespread material, pose a significant challenge as they resist biodegradation by most microbes. Human activities generate vast amounts of plastic waste annually, of which only a small fraction is recycled. The bulk ends up in landfills, incinerators, or leaks into the environment, polluting ecosystems for centuries.
Fortunately, scientific discoveries have revealed microbes that can potentially mitigate this growing problem. In 2016, researchers identified Ideonella sakaiensis 201-F6, a bacterium capable of breaking down PET polymers, the material used in plastic bottles. Subsequent research led to the development of super-enzymes that accelerate the PET degradation process.
Another team of scientists discovered powerful degrading enzymes, known as Leaf Branch Compost Cutinases, in high-temperature environments like compost piles. Genetically engineered variants of these enzymes can degrade PET plastic at temperatures reaching 70°C, weakening the polymer structure and making it digestible. These advancements hold promise for the future of PET recycling.
However, PET is just one type of plastic. To address the widespread pollution caused by other plastics, ongoing research is focused on identifying heat-tolerant microbes in extreme environments and engineering improved plastivorous enzymes. Scientists are also working on designing more environmentally friendly polymers that can be easily broken down by microbes. Ultimately, a comprehensive approach is needed to reduce plastic waste, including responsible plastic use, increased recycling, and innovation in environmentally sustainable materials.