In a recently published paper, researchers use “an LCA approach to calculate the Long-Lasting #CarbonSequestration (LLCS) of #seaweed, which can be understood as the difference between #CarbonFixation & released C throughout the life cycle of seaweed.”
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Using kelp (Laminaria japonica) as an example of seaweed, the present study “validates the procedure of calculating the LLCS of seaweed throughout its whole life cycle in Ailian Bay from nursery to processing into #biochar (fertilizer) as the final product.” 2/9
The results showed that “the #CarbonSequestration (full life cycle) of kelp in Ailian Bay was 97.73g C /m2/year.” 3/9
“#Biomass carbon accounts for approximately 86.15% of the total value (982.53 g C/m2/year) of carbon absorption source of #kelp in Ailian Bay, with the remaining 13.85% consisting of RDOC and sedimentary carbon.” 4/9
“The #CarbonFootprint of the kelp in Ailain Bay is -1146.8 tons of CO2 per year, and the negative value indicates that the #kelp in Ailian Bay can contribute 1146.8 tons of #CarbonSink per year.”
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Moreover, scientists in this study calculated the amount of #biomass carbon that was #sequestrated by seaweed production in China from 2010 to 2020.
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“If all seaweed #biomass carbon is permanently #sequestered the results of this study suggest that about 250,000 tons of CO2 could be fixed by Chinese seaweed
during this decade, which could reach 0.2% of China's peak carbon.”
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Accordingly, the present research concludes that “the mass production of #seaweed can be utilized as an efficient method to #sequestrate carbon and a feasible method for evaluating the effect of kelp farms on climate change.”
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🔗 Link to the paper entitled “Carbon sequestration assessment and analysis in the whole life cycle of seaweed” here ⬇️ iopscience.iop.org/article/10.108…
📰 Here's your round-up of top #CarbonDioxideRemoval News / Developments from this week (28 April - 04 May 2025):
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Mirova announced a $40M investment in carbon projects across Argentina, Costa Rica, and Madagascar to restore 40,000 hectares, sequester 9.5M tonnes of CO₂, and support local communities.
Brazilian carbon removal startup Mombak has secured $30 million in Series A funding, led by Union Square Ventures (USV), to accelerate reforestation and carbon removal projects across the Amazon.
New research shows that large-scale #CDR—essential for 1.5°C or 1°C climate goals—could demand vast land areas if we rely on energy crops, potentially up to 10% of today’s cropland. But tech-based sol could greatly reduce that burden.
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2/ Most CDR plans today focus on bioenergy with carbon capture (#BECCS), reforestation, and afforestation. These options are land-intensive. This study compares them with other portfolios that prioritize low land use, low cost, high tech readiness, and security.
3/ The researchers modeled two total CDR targets:
• 500 GtCO₂ for a 1.5°C pathway
• 1750 GtCO₂ for a 1.0°C pathway
They included not just the land for CDR methods, but also for energy sources like solar and wind to run the full CDR-energy-industry system.
📰 Here's your round-up of top #CarbonDioxideRemoval News / Developments from this week (21 April - 27 April 2025):
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@xprize announced the winners of its $100M CDR competition. The grand prize of $50M went to @mati_carbon for ERW. Other awards included $15M to @NetZero, $8M to @VaultedDeep, $5M to @undocarbon & $1M each to Planetary & Project Harar.
Microsoft has signed a large-scale carbon removal deal, purchasing 1.4 million tonnes of credits from @living_carbon’s reforestation projects on degraded U.S. mine lands.
🚨A recent field study conducted over the Great Barrier Reef has provided key insights regarding sea spray aerosols (SSA).
For the first time, it shows that SSA can reach the cloud base height, advancing Marine Cloud Brightening (#MCB) research.
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2/ MCB is a proposed climate intervention that aims to reflect more sunlight by enhancing marine clouds.
The concept relies on artificially generated sea spray aerosols (SSA) at the ocean surface and their transport in sufficient quantities to low-level maritime clouds.
3/ A portion of the SSA that reaches cloud height can act as additional cloud condensation nuclei and modify cloud microphysical properties, potentially reducing the amount of solar radiation reaching the sea surface.