This is have never understood. I mean, if oil came from dinosaurs (plus any other pre-historic plant or animal) and these creatures lived -- and died -- for about 100+ million years, and if only a tiny % of them did convert into oil, how can mankind use up all this oil in what? 200 years? 250?
And remember, for the greater part of those past few centuries we're not even talking about all of mankind, only that small % in industralized nations.
Oil didn't come from dinosaurs contrary to convential wisdom. Oil came from unicellular microbes. We've always had plenty of those...