• CO₂- Capturing biogenic: 3.19 kg CO₂/kg biochar = CO₂ - reduction of greenhouse gases through photosynthesis

• 100% from biogenic residues - organic materials from waste e.g. green waste, municipal waste

• Biomass to biochar: Green waste is thermally decomposed/gasified in a controlled manner
  with a lack of O₂ and used for energy (pyrolysis at approx. 700 °C)
  

• contains approx. 87 % organic carbon and has a
  surface area of 400 m²/g

• Replaces aggregates with negative environmental impact - Life cycle assessment improvement

• More environmentally friendly than normal concrete

• more difficult flammability - strongly covalent C-C
  bonds delay oxygen transport

• low thermal conductivity- high porosity
  interrupts thermal bridges

• low (bulk) density - lighter concrete

• increased flexural strength - mechanical interlocking
  of the biochar with the cement matrix

#biogen:

• CO₂- Capturing: 3.19 kg CO₂/kg plant carbon

• CO₂- emissions Production: 0.2 kg CO₂/kg vegetable carbon

• If plant carbon is installed, the absorbed CO₂ remains stored for long periods.

• Biochar embodies optimal resource utilization

• Food/wood waste means waste of resources used for production (land, water, energy, inputs)

• Cradle-to-Cradle: concrete with biochar is recyclable, or can be crushed and returned to production

• Approx. 100 CHF /m3 more expensive than conventional concrete

• Additional costs can be partially offset by CO2 certificates

• If the dosage is "wrong", the concrete quality decreases, which in turn has to be compensated for with more cement.
  
  Conclusion: CO2 net emissions from 230 to around 130kg/m3 is a milestone. However, "climate concrete" is a fallacy as much more cement is used to achieve parity.

• CO₂ calculation according to ÖKOBAUDAT current version 2021-II from 25.06.2021 according to EN15804+A2

• NZZ article from October 2023