Carbon dioxide (CO2) is widely known as a climate forcing greenhouse gas. But carbon dioxide contains carbon (C), which is one of the fundamental building blocks of organic life and the basis of countless chemical products. Researchers around the globe are investigating methods to utilise carbon dioxide rather than carbon derived from fossil resources. This research has yielded a number of important breakthroughs in recent years. Industrial processes for the capture and further usage of carbon dioxide, so-called Carbon Capture and Utilisation (CCU) technologies, open up new perspectives on the role of carbon dioxide emissions within a future circular economy.