Harnessing nature to

fix the climate crisis and

restore the oceans


For All of Us

Seafields is developing sustainable open-ocean aquafarms irrigated with proprietary upwelling pipes, sequestering carbon naturally and storing it in safe and permanent depots in the deep ocean.

Seafields will apply nature-based technology to capture COby establishing aquafarms irrigated with warmed,
nutrient-rich deep water in the centers of the inward-rotating, subtropical gyres. These largely unused ocean deserts
cover ~50% of the planet. Fields of the fast-growing, floating seaweed Sargassum will be regularly harvested, the
biomass processed on site for partial nutrient recovery and recycling and the bulk compressed into dense, carbon rich
bales for stacked storage on selected sites of the abyssal plain. Carbon sequestration in these depots will be safe and
permanent. Upwelling of cold, low-salinity deep water in vertical pipes by the Stommel “perpetual salt fountain”
principle will be significantly accelerated by an equivalent downwelling counterflow of warm, high-salinity surface
water. Floating feeder pipes ensure further warming on the surface and effective channeling to the Sargassum fields
floating between them. The down-welled, oxygen-rich, salty surface water will prevent anoxic layers forming under the
farms. The pipes required to reach the Gt scale will be manufactured from seaweed-based bioplastic. In addition,
farming the open ocean using established aquaculture techniques to produce seafood and raw materials will reduce
pressure on coastal natural ecosystems and their biodiversity, while providing economic growth and employment in
the global South.

Sargassum is not going anywhere – so we utilise it in the fight to fix the climate and heal the oceans.

Seafields was introduced to the world at COP26 and since then have built a ocean and carbon science focused team.

With experts in sub sea cable recycling, green fundraising and investment practices, marine environment, carbon cycling and farming we are building a team that doesn’t just care – but has the tools to make a difference.


Reducing our carbon output is only fixing one part of a global problem.

The only way to not only reach net zero but regenerate our life giving eco systems is to remove – or sequester – some of the 50 gigatonnes of CO2 we emit each year. A sinking ship isn’t saved solely by plugging the leaks. If no one gets in there with a bucket the whole thing is going down.

Can you picture a ton of CO2?

A gigaton? A gigaton is a billion tons, an unimaginable burden for our atmosphere, our health and our planet.
It feels abstract, a gas, so lets quantify . One tonne of CO2 is the approximate amount released on a return flight from London to New York. In the US there are 276 million cars, releasing 1.27 gigatons a year. Every human being standing on a scale weights less than a quarter of that. To sequester the 50GtCO2 a year that experts estimate would make a real impact on the environment requires collaboration at a scale humanity has never seen before.

We don’t have competition, we have allies to our cause.

Carbon sequestration isn’t new. Tree planting projects and other terrestrial activities require geopolitical will that doesn’t exist, and space that people need to live and survive on.
To fix the problem at the scale needed we would need to plant 1.2 trillion trees. The space, will and effectiveness of this make it only one angle from which to tackle the problem.

Is terrestrial carbon sequestering really nature’s best solution?

We need to plant 1.2 trillion trees to solve the problem terrestrially. The geopolitical challenge of this makes it practically unachievable, plus trees take time to grow and remove carbon from the atmosphere.

Harnessing nature to restore the oceans and fix the climate crisis, Seafields will harvest the power of the floating seaweed Sargassum to capture and store carbon at scale. Seafields is developing off-shore sustainable aqua-farms, irrigated through pipes that bring nutrient-rich waters to the surface controlling Sargassums growth, producing high value and fossil-fuel replacing products and baling and sinking the remaining carbon-rich biomass to the bottom of the ocean to lock away the carbon.

Hosted by our Scientific Project Lead Franziska Elmer and featuring Dr Mar Fernandez-Mendez  and Victor Smetacek.

Since 2011, vast masses of the free-floating algae Sargassum have been washing ashore on Caribbean beaches – some leaving coastlines three-feet deep in seaweed.

When it isn’t rotting on beaches, Sargassum has incredible properties and could fuel an entire new blue economy.

The Sargassum Podcast aims to cure marine science blindness by providing listeners with an in-depth look into how sargassum impacts local communities, coastal biomes, and the world at large – and how we can harvest it to build a diversified blue economy.

Follow us on our social channels:

'No conversation about the ocean is about the ocean alone, you cannot separate the ocean from the climate crisis. None of the climate crisis can be dealt with without ocean solutions'

@JohnKerry, elder US statesman at the UN Ocean conference in Lisbon.


Presenting at the @SeAgriculture conference in #bremerhaven this week. It was great to interact with so many seaweed experts from around the globe! #sargassum @SeafieldsSL @AWI_Media

Investors are still backing fossil fuels, and governments still hand out billions in subsidies for coal, oil and gas - some $11 million every minute.

For the health of our societies and planet, we need to quit our addiction to fossil fuels.


Great to participate in the @OceanCouncil #UNOC2022 panel discussion on The Business of Ocean Carbon Removal: Building the Supply, Demand, Marketplace and Monitoring for Ocean Carbon Sequestration yesterday alongside @SeafieldsSL @running_tide @vesta_earth @NoahRegen & Kelp Blue

Fresh off the Ocean Stage at the UN Oceans Conference in Lisbon where Co-Founder and Director at Seafields @JohnWedge was invited to a panel hosted by the World Ocean Council on the topic of activating the global blue carbon market.

Snapped with fellow SF Founder Randall Purcell

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