The chemical formula for carbon dioxide is CO₂. This compound consists of one carbon (C) atom covalently bonded to two oxygen (O) atoms. Carbon dioxide is a colorless, odorless gas that is a natural component of Earth's atmosphere. It is produced by various processes, including the respiration of living organisms, the combustion of fossil fuels, and volcanic eruptions. CO₂ is essential for life on Earth, as it serves as a key ingredient in the process of photosynthesis, allowing plants to produce oxygen and organic compounds. However, excessive levels of carbon dioxide contribute to global warming and climate change.