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Going renewable (09/06/16 19:28:00)
    Sustainable renewable - the first condition to be met is high yield. Using plants for solar energy retention is ineffective - just a few percent yield - and there is high consumption of fertilizer and much transportation involved - all with a carbon footprint. And the essential phosphorus is available in limited supply. And then there is cadmium pollution.
    Or maybe not.
    http://www.sciencedirect.com/science/article/pii/S1877705814011059

    So we need high-yield solar energy retention. So far industry has concentrated on photovoltaics. The problem is that peak sunshine and peak demand come at different times - so there must be storage.

    But you cannot run a passenger aircraft on batteries. You need a liquid carbon-based fuel with higher energy density than methanol or ethanol. You need a hydrocarbon. So we need factories that can convert CO2 photochemically into hydrocarbon fuels. Jet fuel, rocket fuel: give me pinene.

    So far we have only biological material as feedstock for the process.

    http://cen.acs.org/articles/92/web/2014/03/Bacteria-Churn-Possible-Rocket-Fuel.html
    http://pubs.acs.org/doi/abs/10.1021/sb4001382

    We need the bacteria to be able to use photochemically generated methanol or formic acid as raw material.

    Still a long way to go. But if I ever go for home-made drones, I'll fuel my turbines with biotech pinene dimer.
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Going renewable