Image by Francesco Ungaro


The Next Big Thing?
The key player in the future of carbon sequestration and food security. 

What is Seaweed?

The term "Seaweed" refers to a variety of macroalgae (or large algae) that may be found in the ocean, rivers, lakes, and other bodies of water. 


Seaweed comes in a plethora of colours, shapes and sizes, totalling around 10,000 different species, including at least 555 species in Indonesia alone. Seaweeds are often classified by their colour: Rhodophyta (red), Chlorophyta (green) or Phaeophyta (brown). Seaweeds vary greatly in size, from only a few millimeters long, to massive kelp that grow in dense “forests” and rise like underwater trees from their seafloor roots. 

Giant Kelp

The giant kelp species, Macrocystis pyrifera

can grow 60 m tall!

CarbonEthics farmer holding harvest of

Eucheuma Cotonii seaweed in Thousand Islands

Image by Silas Baisch

Seaweeds may be found in all climate zones from the warm tropics to the cold polar regions, and in all coastal locations of the planet. They can thrive in warm conditions, and can endure harsh environments in colder polar regions. 

Seaweed and baby turtle
Ecological Functions

Seaweed is to the water what forests or plants are to the land. They absorb carbon, generate oxygen and release it into the atmosphere.


Meanwhile, they also serve as a habitat for a variety of different creatures and a vital source of food for others. They also reduce the effect of ocean acidification, creating healthier habitats for other sea creatures.

Farming and Products

Seaweed is used in a diverse range of products, from biofuel, food, healthcare, cosmetics, and even fertilizers. In 2020, Indonesia was the world’s largest producer of hydrocolloid (or jelly-like) seaweeds, producing about 66% of the world’s total. Indonesian seaweed is primarily used in the production of carrageenan, a natural gelling agent largely used in food and cosmetics. 

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Image by Önder Örtel