There is no security in energy.  There is only adventure.  Will I have the energy to finish the marathon or not?  And, if I finish, will I drop dead immediately after fulfilling my energy vision?  There's no marathon insurance for falling short.  Finish or die!  Or finish and die.  That's the adventure! 

We cannot secure future energy needs with future yet-to-be-invented technology.  We can only strive to be and burn and stay one-step ahead of  cosmic consumptive entropy.    The question should not be "How high will the price of gasoline rise?" but "Do you have enough fire in your belly to watch the sun rise tomorrow?"