There's really no need to worry about running out of crude oil. Things to remember, Texas still has more oil than we can use in 3 lifetimes (just would cost more for fuel moguls to buy). Alaska has plenty of oil, not to mention beneath the Gulf of Mexico is a virtually untapped supply of oil. Worst case, Russia has plenty of oil if someone wants to retrieve it. Right now they will sell anything for a profit. Crude oil supply is really not something we need to be concerned about right now. If it were there would already be plenty of alternative energy sources available, we have the technology just not the will right now. There's way too much money to made with crude oil to give up on it.