MARTYN F. CHILLMAID / SCIENCE PHOTO LIBRARY MARTYN F. CHILLMAID / SCIENCE PHOTO LIBRARY
Carbon dioxide molecule. Model of a carbon dioxide molecule, consisting of two oxygen atoms (red spheres) flanking a carbon atome (grey). Carbon dioxide is a colourless gas that occurs naturally in the atmosphere and has an important role in animal and plant respiration. It is a greenhouse gas, where its increased emission due to human activity contributes to global warming.
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