Solar Cities: Open-source virtual Hackspace for "Biogas Innoventors and Practitioners" Solar C³ities is an international platform with the intention of providing an open-source virtual Hackspace for "Biogas Innoventors and Practitioners" and training for all those researching, developing and deploying sustainable solutions for flourishing societies. Practical Solutions Categories Fuels from waste Water and sewage Micro-generation Solar Cities: Open-source virtual Hackspace for "Biogas Innoventors and Practit… Copied to clipboard