RUSSELL KIGHTLEY / SCIENCE PHOTO LIBRARY RUSSELL KIGHTLEY / SCIENCE PHOTO LIBRARY
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Carbon dioxide, computer artwork. Molecular models of carbon dioxide. The red balls are oxygen and the grey balls are carbon. Each molecule is surrounded by van der Waals radii (pink). Carbon dioxide (CO2) is a colourless gas. It occurs naturally in the atmosphere and is a waste product of animal and plant respiration.
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