Yes Is Mise I do see your point.

Fewer babies = fewer wars = more resources = more oil. Quite simple.
Donate sterilising food to those who are either too ignorant or too selfish to curb their breeding & then expect others to deplete their resources to bail them out all the time. As the old adage goes you've got to be cruel to be kind. Let's put it to the test & if it doesn't work it'll reverta ll by itself anyway.

Come to think of it if we don't curb the fuel guzzling excesses of airline & other travel, motor sports, military exercises, the use of comfort providing fuel guzzling appliances etc. nature may just decide to give us more tsunamis & eathquakes from collapsing oil & gas cavities.
If we don't curb our useage nature will do it for us.

What does Australia Do when the oil runs low?

Open up the Longreach/Richmond oil fields.

While Australia is governed (?) by a party that in the main denies such inconvenient annoyances as climate change and peak oil, nothing is going to be done to prepare us for the effects.
However they will occur no matter how much they are denigrated and sniggered at. It would be a clever approach to prepare for this on an individual basis so that you will have some form of insurance.
The usual trite answer is "they will find and alternative" totally ignoring the fact that if there was one it would be in use now.
With the cost of oil rising, the big oil companies shutting down or selling off their Australian refineries and assets it is obvious even to blind Tony that something is in the wind.
Now would be the time to have a hard look at electric bikes for one way to keep you on the move.
They are reasonably priced, can be charged by home solar and can even carry small amounts of cargo.
Certainly they are a better proposition than the pie in the sky answers that are trotted out as in some of the posts here.

As an addendum to the previous post, it may be of interest that at the moment Australia imports 91% of it's oil now and will have to import 100% by 2020.
That gives you six years to face reality.