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CO₂ is a natural gas that plays a role in photosynthesis and climate regulation, but also contributes to global warming and climate change. Learn more about the formation, sources and effects of CO₂ and how to reduce your carbon footprint. CO₂ n (strong, genitive CO₂, no plural) (inorganic chemistry) carbon dioxide synonyms Synonyms: Kohlendioxid, Kohlenstoffdioxid Carbon dioxide is a chemical compound with the chemical formula CO2. It is made up of molecules that each have one carbon atom covalently double bonded to two oxygen atoms. It is found in a gas state at room temperature and at normally-encountered concentrations it is odorless. कार्बन डाइयाक्साइड (अंग्रेज़ी: carbon dioxide; रासायनिक सूत्र CO2), एक रंगहीन तथा गन्धहीन गैस है जो पृथ्वी पर जीवन के लिये अत्यावश्यक है। धरती ...