letters from the 80ies.....
Ok, like this. Every cars exhaust stinks. Someone wonders why. He figures out Petrol is made from Oil. He figures that Oil is pumped up from deep in the earth. He reads that raw Oil was created over a biochemical process from dead Dionsaurs and dead Dinosauer time vegetation that was covered during Ice age with soil and now after a few the thousand years is realy realy deeply covered with soil. It has not seen daylight for way longer than every Sardin from a tin.
Then he also understands that Ethanol from human times plants could be burned......and found the Illuminati on Cokaine....or some like that....like realy stupid assholes with way too much money and power for their own good....to freak out on the Hol...anyway...
PS: Imagine the boys face when someone tells him using used vegetable oil in an old diesel makes it all smell like a french fries shop and the old fella means it as a bad thing...why argue there? Just estimate how long he'll have left in daylights.