"Look at this fruit farm of the future. There are at least three things that make it different from a farm of today. The first, of course, is that robots are picking the oranges. The second is that the orange trees are not growing in any soil. Now look at the landscape to spot the third difference. The farm is situated in an arid region where little rain falls from the sky. Today, such regions are virtually uninhabited and useless. These three difference show how robot farms of the future will be able to produce more food for the world's people than farming can today."
Ardley, N., (1982) "Our Future Needs (World of Tomorrow)", The Watts Publishing Group