Safeguarding the atmosphere and environment can align with economic growth by transforming emitted carbon into a resource. Carbon capture and utilization (CCU) are essential for mitigating climate change while supporting cleaner energy and resource cycles. The cost of safeguarding the atmosphere and environment may be offset by enhancing economic development through the utilization of emitted carbon as a resource. Although carbon dioxide is widely used in soda, urea, polymers, food preservation, firefighting devices, and limited medical applications, none of these applications are properly linked to carbon mitigation efforts due to challenges in sustainable and integrated carbon capture, storage, and utilization. Currently in their early stages, such technologies require deeper understanding of the physicochemical interactions and chemistry of CO2. This chapter describes the chemical and physicochemical interactions of carbon dioxide in relation to the circular carbon economy, with a focus on energy storage, atmospheric cleaning, and controlling the emission process. It is primarily focused on fixing carbon dioxide into fuels and chemicals using solar energy. A discussion is provided on the thermal splitting of carbon dioxide using solar heat, with reference to the heat of formation for the synthesis of carbon and carbon monoxide, which are commercially and industrially important materials. Here, the thermochemical interaction of carbon dioxide with carbon, methane, hydrogen, and water vapours is discussed as a strategy for sequestration of carbon and reduction in its emissions. The in vivo and in vitro biointeractions of carbon dioxide are discussed as part of the carbon mitigation dream chain. The photocatalytic, photoelectrochemical, and electrochemical conversion strategies are discussed as advanced routes for energy storage and a remedy for controlling climate-altering carbon emissions.