It is clear that oil as we know it is limited in its availability.
Over the last decade or so, people have been trying to predict the moment that the world oil production will not be able to keep up with the (growing) world oil demand.
This moment is call the "peak oil" moment.
You can find many web sites on this topic.
It is generally assumed that as the peak oil scenario develops that the oil prices will sky rocket.
Now, when will this happen? If we are to believe the peak oil publisists: SOON!
Here is a picture from the Peak oil wiki:
From heatingoil.com,
http://www.heatingoil.com/blog/dept-of-energy-acknowledges-possibility-of-pe...fter-2011406/:
The general agreement is that a peak oil scenario will happen, the disagreement is when.
Some say 2015, some say 2030, etc.
I think it is wise to prepare ourselves and our children for such an event.
Bert