Power and renewables

From sea to soil: seaweed biochar for carbon dioxide removal

Kelp forest

Learn more about how seaweed biochar could remove carbon dioxide from the atmosphere while potentially benefiting both sea and soil

Paper

From sea to soil: seaweed biochar for carbon dioxide removal

From Sea to Soil: Seaweed Biochar for CO2 Removal

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This literature review paper explores the potential of seaweed biochar as a scalable nature-based negative-emission technology.

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Mari Vold Bjordal
Mari Vold Bjordal

Aquaculture Researcher

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Ellen Skarsgård
Ellen Skarsgård

Head of Sustainability Development and Climate

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Paper

From sea to soil: seaweed biochar for carbon dioxide removal

About:

This literature review paper explores the potential of seaweed biochar as a scalable nature-based negative-emission technology.

Download
From Sea to Soil: Seaweed Biochar for CO2 Removal

Contact us:

Mari Vold Bjordal
Mari Vold Bjordal

Aquaculture Researcher

Send email
Ellen Skarsgård
Ellen Skarsgård

Head of Sustainability Development and Climate

Send email

To limit global warming to 1.5°C, greenhouse gas (GHG) emissions must be reduced to net zero by 2050. Alongside substantial reductions in fossil fuel emissions, all pathways to net-zero emissions, as outlined by the Intergovernmental Panel on Climate Change (IPCC), involve the removal of carbon dioxide from the atmosphere. In parallel with the climate challenges, we are faced with a nature and biodiversity crisis endangering the ecosystems on which we rely. Hence, implementing solutions that can effectively address both challenges is critical. 

Pyrolysis is a technology that transforms biomass into biochar, fixing the carbon for long-term storage. Farmed seaweed represents a novel feedstock for biochar production and can thus contribute to increased carbon storage. 

To be eligible for carbon crediting, seaweed biochar must be accompanied by well-documented measures that effectively manage and prevent negative environmental and social impacts. For seaweed biochar to become a large-scale negative-emission technology, we must address several knowledge gaps throughout its value chain: 

  • To prevent negative impacts on wild seaweed populations, we need more knowledge about the risk of spreading potential pathogens and genetic material from seaweed farms, as well as strategies for mitigating such risks. 
  • Seaweed biochar, with its higher concentrations of sodium (Na) compared to woody biochar, requires a deeper understanding of optimal application strategies in soil to maximize its beneficial traits while reducing challenges associated with Na concentration.
If these challenges are overcome, and the CO2 uptake and emissions throughout the value chain are documented to be net negative, seaweed biochar could fulfil its potential as a nature-based negative-emission technology benefiting both sea and soil.

Paper

From sea to soil: seaweed biochar for carbon dioxide removal

From Sea to Soil: Seaweed Biochar for CO2 Removal

About:

This literature review paper explores the potential of seaweed biochar as a scalable nature-based negative-emission technology.

Download

Contact us:

Mari Vold Bjordal
Mari Vold Bjordal

Aquaculture Researcher

Send email
Ellen Skarsgård
Ellen Skarsgård

Head of Sustainability Development and Climate

Send email