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     7 years ago 

    I have mentioned the best options in this post, but some other options include:

    Biomass. Biomass or bio-energy, the energy from organic matter for thousands of years, ever since people started burning wood to cook food. ...
    Biogas. ...
    Tidal Energy. ...
    Wind Energy. ...
    Geothermal Energy. ...
    Radiant Energy. ...
    Hydro Electricity. ...
    Compressed Natural Gas.

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