Giant Kelp Off Santa Barbara
About 5 miles off the coast of Santa Barbara, California, a vast swath of giant kelp – which can grow nearly 3 feet per day—sways just below the surface of one of the world’s first open-ocean seaweed farms.
Still in its research phase, the 86-acre project is operated by Ocean Rainforest, a company that aims to fight climate change by growing seaweed at scale: 1 million tons a year by 2030. Although an 86-acre terrestrial farm would be considered boutique, the Ocean Rainforest plot, floating in sight of the Channel Islands, represents a significant leap in size from the average U.S. seaweed farm of 1 to 4 acres—and a new frontier for ocean farming.
Supported by $6.2 million in Series A funding, for a total of $22 million from U.S. and European governments, grants, and venture capital, Ocean Rainforest also operates seaweed farms in the Faroe Islands and Iceland that supply seaweed to the animal-feed, fertilizer, and cosmetic industries.
OR’s goal of substantially decarbonizing these industries—with seaweed, instead of petroleum feedstocks, as raw material—depends on the success of this farm. Growing seaweed in the open ocean, with room to exponentially expand, means the Ocean Rainforest team is tackling how to anchor crops in hundreds of feet of water, withstand intense weather, and monitor a farm that lies many miles from shore.
Most people know that seaweed appears in sushi rolls — but aren’t aware that it’s in their toothpaste and ice cream, too. The planet’s many species of aquatic macroalgae have countless uses, but so far the industry has been centered in Asia. Entrepreneurs are now trying to bring seaweed aquaculture to California
Recent interest in seaweed, however, is focused on more than its commercial applications. Seaweed is seen as one potential solution to pressing ecological and social challenges.
Because seaweed grows much more rapidly than terrestrial plants, and does not require the use of freshwater and arable land, it is seen as an appealing part of a solution to global concerns about food supply.
Seaweed also removes carbon from both the ocean and the atmosphere as it grows — so if the crop is sunk into deep water rather than harvested, farmed seaweed offers a potential strategy for mitigating climate change.
With many consumers looking for sustainable choices, seaweed is becoming very marketable. Many entrepreneurs are now seeing its potential and seeking to increase production along California’s expansive coastline.
