If you're making your diesel from CO2 pulled from the air, pollution aspects don't really apply (at least, CO2 emission issues don't, there's still NOx, but that's what cat piss is for).

Problem is, converting atmospheric CO2 back into fuel makes the efficiency issue drastically worse. Maybe with enough solar panels and windmills, and use the Fischer–Tropsch process with the excess energy that the grid isn't consuming.

Of course, that would be for mobile fuel, if solar plants were going to do anything like that for later use generating electricity during peaks, making diesel is dumb; you'd want to use hydrogen or ammonia for in-place energy storage.

That's not the definition of renewable.

Not really. Its trees from a time before micro organisms evolved the ability to eat dead trees. These days, the solar energy collected by trees will get used to power the metabolisms of fungi before those trees can get buried and eventually become new coal & petroleum.

I suppose an impact from a sufficiently large asteroid could turn the entire crust of the planet into magma, sterilizing it and therefore opening the possibility that new oil might be created some day.

I think I read somewhere that oil will not be produced anymore because now bacteria can break down that biomass that it previously didn't. Hence, non-renewable even on long timescales.

Only if we bring back the dinosaurs. There are six movies (and counting!) explaining why this is not a good idea.

A lot of people have been having their cake days recently. Guess it's the first anniversary of the Reddit exodus.