Millions of tons of plastic waste enter the oceans each year, but a new method using seaweed and marine microorganisms could offer a sustainable alternative to conventional plastics. Researchers at Tel Aviv University have demonstrated that a microbe feeding on seaweed can produce a biodegradable polymer, potentially reducing both ocean pollution and dependence on fossil fuels.
The technique, described in the journal Bioresource Technology, uses Haloferax mediterranei, a microorganism naturally found in salty environments, to convert seaweed into polyhydroxyalkanoate (PHA), a type of polyester that is biodegradable. Unlike traditional bioplastics, which often require fertile soil and fresh water to grow the crops used as feedstock, seaweed grows abundantly in marine environments, making this approach more accessible and environmentally friendly.
Alexander Golberg, one of the researchers, said in a press release that the team has "proved it is possible to produce bioplastic completely based on marine resources in a process that is friendly both to the environment and to its residents." The process avoids competing with food crops for land and water, addressing a common criticism of earlier bioplastics.
Why This Matters for Ocean Health
Every year, an estimated 8 million metric tons of plastic end up in the ocean, and projections suggest that by 2050, the weight of plastic could exceed that of fish. This pollution harms marine life, damages coral reefs, and poses risks to human health. While cleanup efforts and bans on certain single-use plastics are underway, a biodegradable plastic that can be produced from marine resources could complement these measures.
The Tel Aviv team's work is part of a broader push toward sustainable materials. The European Union, for example, recently voted to ban certain single-use plastics, reflecting growing regulatory pressure. However, experts caution that biodegradable plastics are not a silver bullet; they require proper disposal conditions to break down effectively, and their production must be scaled up without causing other environmental harms.
The new method, which relies entirely on marine inputs, could be particularly valuable for coastal communities with limited freshwater and arable land. The researchers note that the process is still in the laboratory stage, and further work is needed to optimize production efficiency and assess the full life-cycle impact.
Still, the approach offers a promising direction for reducing the environmental footprint of plastics. By tapping into the ocean's resources, it may help address both the pollution crisis and the need for more sustainable manufacturing.