VICTOR DE SCHWANBERG / SCIENCE PHOTO LIBRARY VICTOR DE SCHWANBERG / SCIENCE PHOTO LIBRARY
Offsetting carbon emissions. Conceptual image showing an aeroplane balanced on a set of scales against trees. This represents the environmental strategy known as 'carbon offsetting'. This strategy involves the planting of trees (which absorb carbon dioxide) to offset the release of carbon dioxide elsewhere. Carbon offset credits can be traded between companies to meet their targets. Carbon dioxide is the main greenhouse gas that contributes to man-made global warming. It is thought that the main increases in carbon dioxide are due to the burning of fossil fuels for energy, as in aeroplanes.
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