Using CO2 as a chemical feedstock could significantly reduce annual global greenhouse gas emissions. The EU-funded SunCoChem project plans to produce a competitive and integrated solution that helps actively remove excess CO2 from the atmosphere. Specifically, the project will develop a tandem photoelectrocatalytic reactor that will use just sunlight, water and CO2 to produce high-value chemicals. The goal is to raise the technology readiness level to 5. The project targets the production of three chemicals: glycolic acid, which is used as a polymer building block, valeraldehyde – a flavour ingredient – and LimoxalTM – a fragrance ingredient.