Well I disagree, there may be that much oil 'left in the ground' but chucking away the financially viable bollox, which it is by the way, it will get to be 'Energy gain' non-viable before it 'runs out'.
If any one doesn't understand what I am getting at:
It will take more energy to extract they oil than will be gained from the oil.
This is very simple maths.
I don't know where you have got your figure of 2 generations and I am in no way dissing it but I calculated it at lower than that as I have taken into account potential lies by countries on how much reserves they have.
I sincerely hope you are correct.
I may be wrong, you may be wrong we will find out.
Oil contained in sand and shale is very dodgy ground IMO and is yet more evidence that oil is becoming scarcer, whether it is for financial reasons or real life commodity reasons.
Energy Crisis doubters take note.