Carbon dioxide (CO2) is a colorless, odorless gas that consists of one carbon atom and two oxygen atoms. It is a naturally occurring gas that is found in the Earth’s atmosphere, and it is also produced by a variety of human activities, including the burning of fossil fuels, deforestation, and cement production.

Carbon dioxide is an important greenhouse gas, which means that it traps heat in the Earth’s atmosphere and contributes to global warming. However, it is also an important gas for plants, which use it during photosynthesis to produce energy and oxygen.

While carbon dioxide is not toxic to humans at normal atmospheric concentrations, high levels of carbon dioxide can cause headaches, dizziness, and even unconsciousness in enclosed spaces. As such, it is important to ensure that enclosed spaces are properly ventilated and that carbon dioxide levels are monitored to prevent dangerous concentrations.