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    • CommentAuthorKosmopolit
    • CommentTimeDec 11th 2007
     (266.1)
    This is based on a really old idea: back before natural gas was widely available many cities were lit using "water gas" made by reacting coal and steam.

    Later versions of the process used carbon dioxide rather than coal. Even today, a lot of natural gas is very high in carbon dioxide so its reacted with hydrogen to up its carbon monoxide and methane content.

    Anyway Sandia Labs is working on a project to take carbon dioxide and superheat it using solar power to produce carbon monoxide which can then be used to make petrol (amongst other things).

    Only catch is they say they're 20 years away from a commercial product.

    http://www.energy-daily.com/reports/Sunshine_To_Petrol_Project_Seeks_Fuel_From_Thin_Air_999.html