It is increasingly becoming evident that man’s activities within the environment are far exceeding the sustainable capacity of the earth. In essence, the environmental load equals the size of the world’s population x the prosperity or welfare per head of population x the environmental use per unit of prosperity (welfare). It is now apparent that in 50 years’ time there will be an unavoidable requirement to reduce the environmental load 20-50 times. As it is doubtful that this can be achieved, we must either accept an increasing