Electrical appliances’ impact on global warming depends on the source of their energy supply. Appliances will emit no emissions if they are powered by completely clean technologies, such as solar, or hydroelectric energy. However, most appliances are powered by coal or natural gas power plants, which do emit greenhouse gases.
More information can be found about energy at http://www.energy.ca.gov/
Another thing important to mention is the life cycle of the appliances. Manufacture and transport of the appliances invariably result in carbon dioxide emissions, as energy and water must be used in both of these phases of the life of the appliance. It’s true that for most appliances, the majority of their emissions come from using a dirty power supply, but since manufacturing processes are in most cases nowhere near green, this is important as well. Additionally, trashing or recycling the appliances generally results in carbon dioxide emissions which contribute to global warming.
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