Tip for saving energy in the home

Replacing an electric water heater with a solar model can reduce water heat costs by 50 to 80 percent every year - and over the 20-year life of the equipment, more than 50 tons of carbon dioxide emissions will be displaced.

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• emissions facts
• carbon dioxide facts

Why use silicon to make photovoltaic cells?

Silicon from one ton of sand, used in photovoltaic cells, could produce as much electricity as burning 500,000 tons of coal.

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• photovoltaic facts
• sand facts