How is the carbon released from limestone?

Carbon is released from limestone primarily through a process called calcination, where limestone (calcium carbonate) is heated to high temperatures, typically in a kiln. This thermal decomposition produces lime (calcium oxide) and releases carbon dioxide (CO2) as a byproduct. The reaction can be summarized as: CaCO3 (limestone) → CaO (lime) + CO2 (gas). This process is significant in industries like cement production, contributing to greenhouse gas emissions.