You're probably just making a joke but in case others are wondering, your SUV is almost certainly not powered by liquified T-Rexs. Instead, most hydrocarbons w

You're probably just making a joke but in case others are wondering, your SUV is almost certainly not powered by liquified T-Rexs. Instead, most hydrocarbons we have today come from plants ie plankton-like creatures. Also, the position of hydrocarbons is not dictated by the population at that point in time on the earth's surface. Instead, think of the earth like a giant porous sponge with the occasional impervious rock formation that traps the liquid. The hydrocarbons accumulate in those traps over time and lead to the reservoirs we now tap for oil.