Seaweed Coffee Cups Could Replace 500B Plastic-Lined Cups

Your morning coffee might soon come in a cup made from the ocean's fastest-growing plant.

Notpla, a materials company in London, just won a €4 million grant (about $5.4 million) to develop the world's first home-compostable coffee cup coated with seaweed instead of plastic. The company already tested its first sustainable espresso cups at the 2025 Earthshot Prize ceremony in Rio.

The timing couldn't be better. Over 500 billion disposable coffee cups get tossed every year worldwide, and nearly all of them contain hidden plastic linings that make recycling nearly impossible.

Those plastic coatings create two major problems. First, they release microplastic particles into your hot drink, raising health concerns with every sip. Second, they prevent the "paper" cups from breaking down naturally, turning your daily latte habit into lasting environmental damage.

Notpla's solution mimics what nature already perfected. "We follow the blueprint of fruit," explained Karlijn Sibbel, the company's Chief Innovation Officer. "Nature spent billions of years creating packaging that doesn't outlive its contents."

The Ripple Effect

Seaweed brings benefits that extend far beyond replacing plastic. It grows incredibly fast without requiring farmland, fresh water, or fertilizer. While it grows, seaweed actively pulls CO2 from the atmosphere and reduces ocean acidity.

Harvesting seaweed also boosts marine biodiversity and creates jobs in coastal communities that need economic opportunities. "We're using one of nature's most abundant resources to replace millions of single-use plastic items," said Pierre-Yves Paslier, Notpla's co-founder.

The grant funding will help Notpla scale from prototype to mass production. The company is working with partners across the entire supply chain, from raw seaweed farmers to waste management facilities that will test how the cups break down in home compost bins.

Paslier acknowledges the challenge ahead. "The disposable coffee cup looks simple, but it hides a complex problem," he said. "This project gives us the chance to tackle that issue at its source."

The difference between Notpla's approach and previous attempts lies in the uncompromising commitment to natural materials. Many "eco-friendly" alternatives still contain synthetic additives or require industrial composting facilities most people can't access.

With European funding secured and real-world testing underway, your next coffee run might finally leave nothing behind but nutrients for your garden.