Our ocean ecosystem is collapsing

Seaweed and small-scale fishers are the solution

Business as usual is not an option. A rapid increase in restorative seaweed farming is needed to drive ocean and climate restoration. There are 22 million small-scale fishers that can drive this change…

Community. Commerce. Conservation. Climate.

Why should we care?


Small-scale fishers provide 50% of the world’s seafood and 90% of fisheries employment. But they are marginalised by exploitative value chains that drive unsustainable fishing and deepening poverty

Conservation & Climate

The ocean provides 70% of our oxygen, 17% of animal protein, and it has buffered climate change impacts. But it is on the brink of collapse


Seaweed is a more efficient seedstock for bioplastics and biofuels than land crops, and provides habitat for fish. But it is limited by underestimating small-scale fishers as a route to scale

Our ambition is to integrate the world’s largest supply chain for regenerative seaweed, benefiting the 4Cs of Communities, Commerce, Conservation and Climate.

We have a proven track record

Coast 4C is a social enterprise launched by ZSL in 2020 to drive ocean and climate restoration through inclusive value chains for regenerative seaweed and end-of-life fishing nets. Coast 4C builds on the award-winning Net-Works project co-created by ZSL and Interface which validated the inclusive value chain model in the Philippines and successfully tested replication in Cameroon and Indonesia. Take a look at one of our solutions for tackling marine plastic pollution that causes ghost fishing and how we work with responsible global markets to benefit people, planet and prosperity…

Video courtesy of Net-Works/Interface, 2013

Recognition & Research

We are widely recognised for our impactful and science-based approach

Here is a selection of awards and articles. For a more detailed list of awards and articles please see our old Net-Works site here

WINNER of the World Economic Forum UpLink and Friends of Ocean Action ‘Blue Food Challenge’, 2021

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Selected as one of 108 ‘Biodiversity Positive Practices and Actions Around the World’ for showcasing at UN Convention on Biological Diversity COP15, 2021

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Coast 4C featured in Credit Suisse report on “Engaging for the Blue Economy”

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Converting fishing nets to carpets, starring our own Professor Heather Koldewey

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St Andrews Prize for the Environment – finalist in 2015 and 2018

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Guardian Sustainable Business Award 2015 – all winners

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Unlikely partnership yields social and environmental impact

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A Sustainable Safety Net

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The 5th Annual Responsible Business Awards 2014 Winners Announced

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Our Reach and Impact


million metres

 of discarded fishing net diverted from the ocean and regenerated into high value carpet tiles, reducing ghost fishing



of the ocean protected in eight community-based marine protected areas that are 45 times the national average size



with gender equitable financial inclusion through 86 community banks in 32 villages


seaweed farming families

 trained in ecological seaweed farming techniques and supplying Coast 4C



 of no-take ‘replenishment’ zones in seven iMPAs, more than 20 times the national average size.



 of suitable habitat for ecological seaweed farming zoned within seven iMPAs: enough for 1,368 family farms

There is so much more to achieve. Find out how and join us today.