ABSTRACT
Over 10,000 years ago predatory man, probably aided by climatic change, discovered the use of domestic animals and agriculture, thus bringing about the first agricultural revolution. Then, some time before 3000 BC men began to explore the possibilities of working metal, and eventually with the use of iron for tools they gained a new ascendancy over the environment. The greater control of the biological converters, plants and animals, led to a larger and more dependable food supply, so that populations increased and people began to live together in ports and cities.
