By Max Marcovitch
October 1, 2024
Meet the startup turning the tide on plastic pollution
5 min
CI Ventures has supported Sway since its inception — from early prototypes to new technologies, which could enable seaweed to replace flexible plastics at scale.
Conservation News sat down with Julia Marsh, Sway’s CEO and co-founder, and Gracie White, who leads CI Ventures’ ocean investments, to learn how the company is fighting plastic pollution.
Seaweed collected in Monterey Bay, California.
Sway turns seaweed into plastic. How does that work?
Julia Marsh: Conventional plastics are made by melting and forming petroleum-derived resin into finished products, like the single-use plastic packaging used to keep foods fresh. In our lab, Sway has created a resin made entirely from stretchy natural polymers that mimic the look and feel of plastic. Our material is derived from seaweed and plants, and sourced from responsible ocean farmers around the world. It is designed to fit right into the same machinery that creates traditional plastics, meaning we don’t need to overhaul manufacturing systems. Best of all, it decomposes after use.
You describe plastic waste as a “design flaw.” How so?
JM: Plastic pollution is often the result of poor design choices made at the beginning of production. According to some estimates, approximately 80 percent of environmental waste is determined at the design stage. I’m a designer myself; I see how packaging design choices can help make products more beautiful, more accessible and more efficient. Good design can lead to meaningful impact.
And from CI Ventures’ perspective, what’s exciting about Sway?
Gracie White: There are several factors that excite me. First, they aren’t sourcing just one type of seaweed. They are using a wide variety of species from different countries, from Mexico to Brazil to Indonesia and beyond, which is which helps mitigate risks of supply issues. The seaweed industry is growing, but it lacks regulation. That lack of regulation has led to some supply chain and production practices that can actually degrade the environment and hurt farmers’ livelihoods. Our hope is that as Sway grows, they could become a major purchaser of seaweed from Latin America and Southeast Asia. And if they're implementing certain sustainability standards, then those standards will be implemented throughout seaweed supply chains more broadly.
A seaweed farmer in Indonesia.
What hurdles have prevented better, most sustainable plastic products?
JM: Traditional plastics have been around for more than a century, during which time plastic manufacturers have become heavily subsidized through state and local tax breaks. While there has been progress in developing more sustainable plastics using renewable feedstock alternatives — like corn, potato and sugarcane — these materials fall short in terms of performance, cost and scalability. To truly beat traditional plastic, we have to match or exceed its inherent benefits — and this takes time.
How do you get others to buy into this vision?
JM: No matter where in the world you live, it’s easy to see our planet has a plastic problem. Consumer and regulatory pressures are driving brands to make sustainability commitments left and right, yet greenwashing is rampant and bioplastics currently on the market often have major shortcomings. True solutions can feel difficult to identify.
What changes do you think we’ll see in production in the next decade?
JM: Rather than degrading our planet, so-called “regenerative feedstocks” like seaweed have the capacity to nourish ecosystems at every step of the supply chain. We anticipate that over the next decade, brands, investors and policymakers will better understand and prioritize using nature as a climate solution. That includes using materials derived from plants and other renewable materials as opposed to non-renewable materials, like petroleum.
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