Speculative Hard Science and Science Fiction. And Metal.
Wood? Big deal. Biomass is listed in the big list of fuels, too. Remember that robotic taster a few years back that couldn't distinguish people from bacon? We're fucked.
Even worse, I got this from a blog post supposing that the drones would be using battlefield corpses for fuel.
Eating the enemy soldiers is a pretty big drain on collected intelligence.
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