Brown seaweed
Knotted wrack, dried and milled
Ascophyllum nodosum — Ascophyllum Nodosum Extract
The default Run below is Connemara, Ireland, 1.69 kgCO2e/kg gross, Category B. Published values for this ingredient span 0.40 to 2.60 kgCO2e/kg, which is why a number without its production parameters is not worth forwarding.
Species record
- Species
- Ascophyllum nodosum
- INCI name
- Ascophyllum Nodosum Extract
- Group
- Brown seaweed
- Harvest methods
- Hand-cut intertidal harvest. Mechanical rake harvest
- Conservation status
- Not assessed by IUCN. Managed by cutting height rules in Ireland and Canada.
- Typical uses
- Biostimulants, animal feed, cosmetic extracts, food supplements.
- Declared unit
- One kilogram of dried, milled knotted wrack at 10% residual moisture.
- Typical gross range
- 0.40 to 2.60 kgCO2e/kg, Category B
- Default sourcing region
- Connemara, Ireland, Route distance, Galway to Rotterdam gate
- Higher dry matter than kelp, so less water to evaporate per kilogram of product.
- Hand harvest keeps Scope 1 low and makes grid intensity decisive.
Calculator
Seven inputs, every one already filled with a regional default. Change the two or three you know. Nothing is submitted and nothing is saved.
Line-item inventory
| Line | Scope | kgCO2e/kg |
|---|---|---|
| Harvest and vessel fuel4.4 kg wet biomass at 2.10 l diesel per tonne2.68 kgCO2e/litre · IPCC 2006 Guidelines Vol. 2 stationary and mobile combustion, AR6 GWP100 · Category B | 1 | 0.025 |
| Drying energy4.06 kWh/kg on the Ireland grid0.2790 kgCO2e/kWh · IEA Emission Factors 2024, national average generation intensity · Category B | 2 | 1.132 |
| Extraction, milling and utilities1.14 kWh/kg on the Ireland grid0.2790 kgCO2e/kWh · IEA Emission Factors 2024, national average generation intensity · Category B | 2 | 0.319 |
| Fuel supply chain, well-to-tank0.009 l diesel upstream0.64 kgCO2e/litre · UK DESNZ conversion factors 2024, WTT diesel · Category B | 3 | 0.006 |
| Harvest gear and cultivation inputsGear, seed, nutrients and process chemicals, amortised0.011 kgCO2e/kg · Published Atlantic wrack LCA literature, hand-harvested dried meal, gross cradle-to-gate. · Category B | 3 | 0.011 |
| Inbound haul, wet biomass4.4 kg over 70 km by road, Connemara, Ireland0.096 kgCO2e/t-km · GLEC Framework v3.0 default, >32t diesel truck · Category B | 3 | 0.030 |
| Outbound freight, finished ingredient1 kg over 1,300 km, road freight, heavy goods0.096 kgCO2e/t-km · GLEC Framework v3.0 default, >32t diesel truck · Category B | 3 | 0.125 |
| Packaging0.020 kg pp woven sack per kg1.95 kgCO2e/kg · Plastics Europe eco-profile, PP resin plus conversion · Category B | 3 | 0.039 |
| Gross footprint | 1+2+3 | 1.686 |
Every factor and its source is printed in the Report. The full factor set is on the Methodology page.
Gross footprint, cradle-to-gate
Species-specific secondary data with named sources, applied to your stated production parameters.
Scope 1
1.5%
Harvest and fuel
Scope 2
86.1%
Purchased electricity
Scope 3
12.5%
Upstream and freight
Largest lever: drying energy, 1.13 kgCO2e/kg of the total, Category B.
Batch total for 1,000 kg: 1,685.8 kgCO2e
Biogenic uptake
0.91 kgCO2e/kg
Reported separately. Non-permanent. Not subtracted.
Land-based comparison
Bluecarbon Methodology 2026.2, Category B.
Published dairy protein LCA range, mid-point. Category C.
Published livestock LCA range, mid-point. Category C.
Published bovine hide and bone processing LCA range, mid-point. Category C.
Blue Bioeconomy Score: 40.0th percentile within the peer set of 6 brown seaweed defaults in this database, Methodology 2026.2.
Get the Report
€390- Line-item inventory, every emission factor with its source
- Gross footprint with its Category grade, and the Scope 1/2/3 split
- Biogenic uptake reported separately, never subtracted
- Peer set and Blue Bioeconomy Score, with the peer set named
- Reduction section, quantified in kgCO2e/kg
- Methodology version, limitations, and the colophon
One ingredient, one Run, Ascophyllum nodosum, Category B. Nothing recurs.
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