Man is a creature whose evolutionary environment has been the open air. His nerves, muscles, and senses have developed across three million years in contiguity with natural earth, crude stone, live wood, wind, and rain. Now this creature is suddenly--on the geologic scale, instantaneously--shifted to an unnatural environment of metal and glass, plastic and plywood, to which his psychic substrata lack all compatibility. The wonder is not that we have so much mental instability but so little.

Humans in Europe and western Asia evolved into Homo neanderthalensis (‘Man from the Neander Valley’), popularly referred to simply as ‘Neanderthals’. Neanderthals, bulkier and more muscular than us Sapiens, were well adapted to the cold climate of Ice Age western Eurasia. The more eastern regions of Asia were populated by Homo erectus, ‘Upright Man’, who survived there for close to 2 million years, making it the most durable human species ever. This record is unlikely to be broken even by our own species. It is doubtful whether Homo sapiens will still be around a thousand years from now, so 2 million years is really out of our league.

If man evolved from monkeys and apes, why do we still have monkeys and apes?

I believe that man is the product of natural evolution that is born from the conflict of being a prisoner and separated from nature, and from the need to find unity and harmony with it.

It is said that humanity has evolved one-sidedly, growing in technical power without any comparable growth in moral integrity, or, as some would prefer to say, without comparable progress in education and rational thinking. Yet the problem is more basic. The root of the matter is the way in which we feel and conceive ourselves as human beings, our sensation of being alive, of individual existence and identity.

We are inescapably the result of a long heritage of learning, adaptation, mutation and evolution, the product of a history which predates our birth as a biological species and stretches back over many thousand millennia... Going further back, we share a common ancestry with our fellow primates; and going still further back, we share a common ancestry with all other living creatures and plants down to the simplest microbe. The further back we go, the greater the difference from external appearances and behavior patterns which we observe today.

In the evolutionary pattern of thought, there is neither need nor room for the supernatural. The earth was not created; it evolved. So did all the animals and plants that inhabit it, including our human selves, mind and soul as well as brain and body. So did religion.

Evolution of Man. For it must be realized that the evolution of man is a process still going on, and by no means yet complete. Darwinian writings have taught the modern world to regard the ape as an ancestor, but the simple conceit of Western speculation has rarely permitted European evolutionists to look in the other direction, and recognize the probability, that to our remote descendants we may be, as that unwelcome progenitor to us. Yet the two facts just declared hinge together. The higher evolution will be accomplished by our progress through the successive worlds of the system; and in higher forms we shall return to this earth again and again. But the avenues of thought through which we look forward to this prospect, are of almost inconceivable length.

This earth is one of the rare spots in the cosmos where mind has flowered. Man is a product of nearly three billion years of evolution, in whose person the evolutionary process has at last become conscious of itself and its possibilities. Whether he likes it or not, he is responsible for the whole further evolution of our planet.

In speaking of evolution it is necessary to understand from the outset that no mechanical evolution is possible. The evolution of man is the evolution of his consciousness.

This is the last programme in this natural history, and it's very different from all the others because it's been devoted to just one animal: ourselves. And that may have been a very misleading thing to have done. It may have given the impression that somehow man was the ultimate triumph of evolution, that all those thousands of millions of years of development had no purpose other than to put man on Earth. There is no scientific evidence whatsoever for such a belief. No reason to suppose that man's stay on Earth should be any longer than that of the dinosaurs. He may have learned how to control his environment, how to pass on information from one generation to another, but the very forces of evolution that brought him into existence here on these African plains are still at work elsewhere in the world, and if man were to disappear, for whatever reason, there is doubtless somewhere some small, unobtrusive creature that would seize the opportunity and, with a spurt of evolution, take man's place. But although denying a special place in the world may be becomingly modest, the fact remains that man has an unprecedented control over the world and everything in it. And so, whether he likes it or not, what happens next is very largely up to him.

Those same three factors applied to human beings. Like bees, our ancestors were (1) territorial creatures with a fondness for defensible nests (such as caves) who (2) gave birth to needy offspring that required enormous amounts of care, which had to be given while (3) the group was under threat from neighboring groups. For hundreds of thousands of years, therefore, conditions were in place that pulled for the evolution of ultrasociality, and as a result, we are the only ultrasocial primate. The human lineage may have started off acting very much like chimps,48 but by the time our ancestors started walking out of Africa, they had become at least a little bit like bees. And much later, when some groups began planting crops and orchards, and then building granaries, storage sheds, fenced pastures, and permanent homes, they had an even steadier food supply that had to be defended even more vigorously. Like bees, humans began building ever more elaborate nests, and in just a few thousand years, a new kind of vehicle appeared on Earth — the city-state, able to raise walls and armies.49 City-states and, later, empires spread rapidly across Eurasia, North Africa, and Mesoamerica, changing many of the Earth’s ecosystems and allowing the total tonnage of human beings to shoot up from insignificance at the start of the Holocene (around twelve thousand years ago) to world domination today.50 As the colonial insects did to the other insects, we have pushed all other mammals to the margins, to extinction, or to servitude. The analogy to bees is not shallow or loose. Despite their many differences, human civilizations and beehives are both products of major transitions in evolutionary history. They are motorboats.

The Earth is our home, our parent. Our kind of life arose and evolved here. The human species is coming of age here. It is on this world that we developed our passion for exploring the Cosmos, and it is here that we are, in some pain and with no guarantees, working out our destiny.

Part of our evolutionary heritage is the ability to adapt -- species that survive, adapt. Humans adapt by altering their priorities to match evolving values.