I feel the need to reiterate that trying to replace petroleum with ethanol made from crops grown on farms is, as it stands today, a thoroughly idiotic thing to do. That's why I suspect that transportation will be massively cut back in 2050 compared to what we have today, assuming that predictions of diminishing oil supply are accurate.
But there should always be hope. And the future saviour of human transportation and civilisation as we know it might just be slime!
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