Abstract

At the threshold of the Twenty-First Century, Humankind is facing a new Era. After 6 million years of genomic independent existence and after 2 million years of increased capacity in learning and transmitting information among the members of the group and from one generation to the next which supported an enduring technological tradition, we are now facing the effects of a dramatic and accelerated population growth. In the last two centuries human population size increased from one billion in 1835, to 2.5 billion by 1950. This number then doubled in only 45 years to almost 6 billion. This unprecedented increase in numbers, affecting specific geographical areas, has accentuated the deterioration of the natural environment caused by the misuse of natural resources and the depletion of fertile soils due to the clearance of forests, climatic changes and pollution.