Where does it said there are pretty?? We know there are enough oil or petrol that could last 100s to 1000s of years. And there are known Lithium reserve that could last us 100s years even if we keep the current pace of development.

The problem with both is extraction cost. How can we effectively extract it that provide a profits at this current price. It wasn't until recently US mastered the technique of flasking oil we have more then what we need.