Production of energy produces carbon dioxide and other greenhouse gases from the combustion of fossil fuels. Sources such as oil, coal and natural gas are used most frequently to produce electricity. In the UK, 74%1 of energy comes from these sources.
By saving energy you reduce the demand for electricity supply and the amount of carbon dioxide produced. Also the electrical supply system is not perfect, neither is the system for transporting electricity around the UK and there is a loss (typically 72%2) associated with the amount of energy produced.
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