Boyan Slat was 18 when he decided to clean up the Pacific Ocean. Now in his early thirties, the Dutch engineer has learned that the ocean's salvation may lie not in its waters, but in the rivers that feed them.
When Ocean Cleanup first launched, Slat's vision was audacious and specific: remove the plastic floating in the Giant Pacific Garbage Patch, a mass of debris so vast it can be seen from the International Space Station. Research would later quantify the scale of that ambition—1.8 trillion pieces of floating plastic collectively weighing more than 80,000 tons. The task proved impossible. But rather than abandon his mission, Slat pivoted. He discovered something more powerful than a cleanup target: a source.
Just 1,000 of the world's rivers are responsible for nearly 80 percent of the plastic waste added to oceans each year. In fact, 90 percent of all ocean pollution originates from rivers. This insight transformed Ocean Cleanup's strategy. Instead of chasing trash across open ocean, the organization would intercept it before it left land.
Today, the Interceptor—a solar-powered floating barge system—embodies this new approach. One sits at the mouth of Ballona Creek in Los Angeles, where it collects trash from a 130-square-mile urban drainage network before the water reaches Santa Monica Bay. James Patterson, who oversees the LA system, describes the Interceptor's engineering as deceptively elegant: a V-shaped floating boom funnels rubbish toward a conveyor belt that lifts it into a first barge. An automated shuttle distributes the waste into six dumpsters with a total capacity of ten tons—roughly the load of a full dump truck. Solar panels power the entire operation.
In 2025 alone, the Ballona Creek Interceptor collected 143,710 pounds of trash. The impact ripples outward. Beach cities south of the project have already reduced their budgets for beach grooming, simply because there is less waste on the sand.
The Los Angeles system is one of 21 Interceptors now operating across ten countries—Malaysia, Indonesia, Vietnam, Guatemala, Jamaica, the Dominican Republic, and the United States. Each required specialized design. As Patterson notes, "There's no one size fits all. Every river is different in how they act, where you can deploy, what the local government and permitting time lines look like, and just the conditions of nature."
The LA pilot, which began in 2022, cost $1.3 million to design and permit, another $1.5 million for custom barges and booms, and requires $650,000 annually for maintenance. Ocean Cleanup has raised more than $30 million to date and is providing the system to Los Angeles County free of charge. Two more Interceptors are planned for the San Gabriel River and the Los Angeles River.
Patterson's words capture the philosophy driving this work: "We have to turn the faucet off before we can scoop the ocean, or else all we're doing is taking out legacy trash to replace it with new trash." Ocean Cleanup is learning that the most effective ocean cleanup happens on land, in the rivers that connect human communities to the sea. The organization's pivot from an impossible dream to a systematic approach suggests that even the most ambitious environmental goals become achievable when we address them at their source.