VICTOR DE SCHWANBERG / SCIENCE PHOTO LIBRARY VICTOR DE SCHWANBERG / SCIENCE PHOTO LIBRARY
Carbon trading. Conceptual image showing coal balanced on a set of scales against UK bank notes. This represents the environmental management policy known as 'carbon trading'. Carbon trading is done in units of carbon dioxide. This is the main greenhouse gas that contributes to man-made global warming, also known as anthropogenic global warming (AGW). It is thought that the main increases in carbon dioxide are due to the burning of fossil fuels (such as coal) for energy.
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