The chemistry isn't that hard to produce oil from basically nothing of value, but the energy costs aren't trivial, and that means we don't need a 1:1 energy replacement from fossil fuel sources to solar panels, we need more like a 10x increase in global energy production to replace fossil fuels with solar for example.

The only really feasible way to produce that much electricity renewably by this point in time or even within the next 20+ years has been nuclear energy, which the world largely turned their backs on the last few decades and left us in an even bigger hole to fill.