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Why everyone talks about switching to electric cars while nobody ever mentions electric heating of buildings as environmentally friendly alternative? Because it isn’t? Why bother with electricity-saving lightbulbs while EV owners burn the current like there’s no tomorrow...

There's plenty, like a lot, of shale oil available at $80-100/bbl, which allows for significantly less than $10/g gas.

The only meaningful challenge to $10/g gas is policy (ie taxation).

Algae derived oil, if it could be made to work at scale, has none of those problems. It is a not unreasonable upper limit for a totally renewable source of petrochemical fuel.