What to use when the oil runs out
Part of the attraction of oil for most of us has probably always been its key-turning, switch-flicking simplicity.
This one substance has given us food, warmth, chemicals, medicines, clothing - and above all mobility.
So it is natural enough for us to look for one neat and simple replacement which will be the perfect substitute for oil in all its versatile guises.
But the harsh truth is that nothing is going to be capable of doing everything that oil does - not yet, perhaps never.