@urlyman@mastodon.social I agree but one thought - low tech big industrial diesel engines can run on very poor quality fuel (the main design requirement was to run on the left overs of coke from kilns iirc) so I can see alternatives being found like vegetable oil. Hopefully not causing a food shortage. Modern diesels found in private cars that need a quite refined fuel will as you say fall by the way side. That old Peugeot from the 70s will likely be converted to run on chip fat.