There is not enough petrol in the world for everybody now, and each year there is less, so what are we going to do when it finishes?
Perhaps we will go back to horses and carriages and bicycles.
In the Second World War, some people did not use petrol in their cars.
They made gas from wood and plants instead, and then they put it in big bags on top of their cars.
The cars did not go fast, but it was better than nothing.
But we cannot cut down all our trees to make gas; we need them for other things too.
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