The chemical symbol for carbon dioxide is CO2. This compound consists of one carbon atom covalently bonded to two oxygen atoms. Carbon dioxide is a colorless, odorless gas at room temperature and is a natural component of the atmosphere. It plays a crucial role in the Earth's carbon cycle and is produced by various processes, including respiration, combustion, and volcanic activity. CO2 is also utilized by plants during photosynthesis to produce oxygen and glucose, making it essential for life on Earth. However, elevated levels of carbon dioxide in the atmosphere are contributing to climate change.