CO2 and CO: sustainable carbon sources for circular value creation CO2: Sources and volumes Conventional processes for hydrogen production Alternative biological and biotechnological processes for hydrogen production Production of synthesis gas Chemical-catalytic conversion of CO2 and CO Microbial processes: Biocatalytic conversion Microbial processes for the conversion of CO2 und CO Microbial processes: Current developments in gas fermentation Microbial processes: Production of polyhydroxyalkanoates from CO2 Microbial processes: Photosynthetic microalgae Challenges in down streaming from chemical and biotechnological processes Utilization of C1 gas streams from steelworks Utilization of C1 gas streams from cement plants Utilization of C1 gas streams form power plants Utilization of C1 gas streams from chemical processes Utilization of C1 gas streams from bioprocesses including biogas plants Utilization of residuals and C1 gas streams: Organic waste, sludge and agricultural residuals Utilization of residuals and C1 gas streams: Pyrolysis process of Concord Blue Utilization of residuals and C1 gas streams: CO2 sources in agriculture Recycling CO2 from waste incineration closes carbon cycles Utilization of C1 gases: Impact on sustainability Regional Development Utilization of C1 gases: The regulatory framework R&D&I and industry examples: Challenges and opportunities in scaling up R&D&I and industry examples: Covestros Dream Production R&D&I and industry examples: LanzaTechs gas fermentation R&D&I and industry examples: The CCU project Carbon2Chem R&D&I and industry examples: The CO2 electrorefinery a new concept for carbon dioxide (CO2) capture and utilization (CCU).-R&D&I and industry examples: The vision of b.fab GmbH R&D&I and industry examples: Industrial gases as a carbon source for terpene production ZeroCarbFP: A two-step microbial conversion of CO2-rich off-gas into valuable products Introduction R&D&I and industry examples: Ineratecs ICO2CHEM project to utilize CO2 Piloting, scale-up, and demonstration Final evaluation and summary