system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: How long will it take the world to run out of oil?
gpt
Realistically, we will never truly run out of oil.  As the "easy" sources of oil begin to run out, the price of oil goes up and new technology allows us to access more oil that was too expensive to get at before.  At a certain price point it is actually feasible for us to *create* oil here on surface from raw materials (you may have heard of something called "biodiesel" which is a form of this). 

What is ultimately going to happen is that as oil becomes more expensive, we will use less of it and switch to other energy sources that are either becoming cheaper, or will be economically viable at the higher price of oil.