References
On the ground: what the blue economy shows
Local loops designed like ecosystems feed soils and create income and jobs. Here are examples with figures, taken from projects documented by Gunter Pauli and the ZERI network.
These are not BiocharKool projects: they are the references that inspire it. Figures are those reported by the projects and their sources, without independent verification.
Six loops at a glance
| Loop | Flows | Reported results |
|---|---|---|
| Coffee → mushrooms → animals | Coffee grounds and pulp, oyster mushrooms, spent substrate, animal feed | 1 t of waste yields 0.5 to 1.5 t of mushrooms; three incomes instead of one; more than 3,000 businesses in 20 years |
| Integrated farm (Fiji) | Spent grain, mushrooms, pigs, biogas, algae, fish | 15 t of fish per hectare without bought feed; 240 pigs per year on 1 ha; 2 full-time workers |
| Nappies → terra preta → orchards (Berlin) | Compostable nappies, biomass, biochar | At least 50 kg of fruit per tree per year after 5 years; cheaper than waste collection |
| Forest → resin → water (Las Gaviotas, Colombia) | Pines planted with root fungi, resin, used cooking oil | 8,000 ha replanted; soil biomass multiplied by 16 in 5 years; about 25 t of carbon per hectare per year |
| Thistle → biorefinery (Sardinia) | Wild cardoon, converted factory | 4 product families; up to 100 jobs per 1,000 t |
| Organic waste → larvae → feed | Manure, market or slaughterhouse waste | Larvae with about 35% protein; 80% less waste |
Carbon makes fertility
- A healthy soil contains more than 10% organic carbon; a depleted soil often has less than 1%. (From Poo to Tree)
- One extra point of organic matter lets a hectare hold about 170,000 more litres of water. (Diaper Solutions, 2022)
- Soils hold twice as much carbon as the atmosphere and vegetation combined. (From Poo to Tree)
The method, seen from the field
- Map. For each project, Gunter Pauli draws the flows with their units: tonnes, litres, euros and jobs per month. Resources are often invisible: the Netherlands produces 250,000 tonnes of wet coffee grounds a year. (Plan A for Argentina; Invigorating Rio)
- Qualify. Choosing the species matters as much as sorting the residue: a tonne of coffee waste yields 0.5 to 1.5 tonnes of oyster mushrooms, but only 10 to 15% in button mushrooms. (Coffee Solutions, 2021)
- Loop. Mushrooms are worth far more than compost, and the leftover substrate becomes animal feed. (Plan A; The Blue Economy 6.0)
- Finance. A region that depends on a single product suffers as soon as its price falls. The blue economy prefers a cluster of linked activities to a single supply chain. (Invigorating Rio)
- Measure and share. Shared as open source from 1995 to 2014, the coffee-mushroom model reportedly gave rise to more than 3,000 businesses and 75,000 direct jobs. (Case 106, 2015)
Robustness, seen from the field
- Diversity. On the Fiji farm, 7 fish species each occupy their own level of the pond. (Plan A)
- Redundancy. The Sardinian biorefinery makes 4 product families from cardoon, and its residues have three outlets: biogas and fertiliser, animal feed, and plant rennet for cheese. (Invigorating Rio)
- Reserves. In the forest, mother trees feed young trees through the fungal network. (The Blue Economy 6.0)
- Proximity. On El Hierro (Canary Islands), the island feeds its goats with what grows locally instead of importing hay. (Plan A)
- Repairability. At Las Gaviotas, resin is steam-distilled, without chemicals or heavy investment. (Coffee Solutions)
Who it is for, seen from the field
- Local authorities. In Berlin, terra preta plants urban orchards for less than the cost of waste collection. In Hidaka (Japan), household waste replaces part of a cement kiln’s fuel; the town closed its landfill. (The Plastic Solutions; G. Pauli blog, 2020)
- Farms. The Herrmannsdorf farm (Germany) supports more than 280 full-time jobs on 100 hectares. (Plan A)
- Winegrowers. Pines planted along vines cool the plots and delay ripening, a response to warming. (Coffee Solutions)
- Brewers and food trades. A brewery uses only 8% of its malt. Restaurant coffee grounds grow oyster mushrooms sold for up to €13 a kilo (Funghi Espresso, France). (Case 109; Case 106)
- Community spaces. In Rotterdam, RotterZwam turned a former swimming pool into a mushroom farm on coffee grounds and a training centre. (Case 106)
Sources
- Gunter Pauli: L’Économie bleue 5.0 (2024), The Blue Economy 6.0 (2026), Invigorating Rio (2024), Plan A for Argentina (2020), Morocco’s Model (2020), The Plastic Solutions (2020), Coffee Solutions (2021), Diaper Solutions (2022).
- ZERI / Blue Economy case studies: no. 3, 28, 47, 84 (2010-2012), no. 104, 106, 109 (2015).
- Black Soldier Fly Biowaste Processing (2017); Gunter’s Fables no. 41 and 110.