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Industrial pollution. A plume of smoke rises from a chimney at a power station. In the background, vast columns of steam rise from the station's cooling towers. The combustion of fossil fuels to produce electricity results in large quantities of carbon dioxide (the main 'Greenhouse' gas) and sulphur oxides (components of 'acid rain'). Carbon dioxide emissions may only be reducded by greater combustion efficiencies, whilst sulphur oxides need to be removed by chemical processes such as flue gas desulphurisation (FGD). In contrast, the cooling towers emit nothing but harmless water.
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