The definition of a CO2 temperature is the temperature at which carbon dioxide (CO2) changes from a solid to a gas. This temperature is known as the sublimation point of CO2 and is usually around -78.5°C (-109.3°F). At this temperature, the CO2 molecules become so energetic that they can break free from the solid form and enter the atmosphere as a gas. This process is known as sublimation and is a common way for CO2 to enter the atmosphere. In addition to sublimation, CO2 can also enter the atmosphere through evaporation and combustion.

The CO2 temperature is important for a variety of reasons. For example, it affects the rate at which CO2 is released into the atmosphere. It also affects the rate at which CO2 is absorbed by plants and other organisms. In addition, the CO2 temperature can affect the rate at which CO2 is converted into other forms of energy, such as electricity. Finally, the CO2 temperature can also affect the rate at which CO2 is converted into other forms of matter, such as water vapor. All of these processes are important for maintaining the balance of CO2 in the atmosphere.