Our situation may parallels to a well-known riddle. If the area of a petri dish covered in bacteria doubles every hour, you inculate the dish at noon on day one and it is completely full at noon two days later (and thereafter the population crashes because it has exhausted its food source and inundated the petri dish with waste), when is the dish half full? The answer, of course, is at 11 A.M. on the final day at 9 A.M.,7/8 of the resources available for continued growth are still present. The question right now for humans is: How close is it to noon