Partners & Materials
What each partner supplied
AlgaeWall Solutions
700 m² photobioreactor · absorbs 70 t CO₂/year
Hempcrete Iberia
500 m³ hempcrete · low‑carbon wall material
Solaris Energy
30 kWp solar PV · 100% annual energy
GeoTherm Andalusia
200 m borehole · COP 4.5 heat pump
EcoBuild Rentals
all‑electric fleet · 0 t on‑site emissions
Red Eléctrica (Spain)
grid · 56% renewable (2024)
Strawboard Tech
strawboard · agricultural waste material
Bamboo Supply Co.
bamboo · fast‑growing, no‑cut material
Local Transport
logistics · +10 t transport CO₂
Data Sources
algae wall uptake (84‑770 kg CO₂/m² · used 100 kg) Zijffers et al. (2010)
hempcrete carbon storage (110‑300 kg CO₂/m³) Biomass Review (2024)
Spain grid renewable (56% in 2024) IEA (2025)
human respiration (365 kg CO₂/person/year) IPCC (2006)
ground‑source heat pump COP 4.5 ASHRAE (2020)
tree CO₂ absorption (20‑40 kg/tree/year, used 20) U.S. Forest Service