A Wisdom Archive on The Gaia Hypothesis

What is The Gaia Hypothesis?

The Gaia Hypothesis proposes that our planet functions as a single organism that maintains conditions necessary for its survival. Formulated by James Lovelock in the mid-1960s and published in a book in 1979, this controversial idea has spawned several interesting ideas and many new areas of research. While this hypothesis is by no means substantiated, it provides many useful lessons about the interaction of physical, chemical, geological, and biological processes on Earth. Thus, it is a good starting point for our study of oceanography, providing a broad overview of the kinds of processes that will interest us throughout the semester.

Throughout history, the concept of Mother Earth has been a part of human culture in one form or another. Everybody has heard of Mother Earth, but have you ever stopped to think who (or what) Mother Earth is? Consider these explanations.

The Hopi name for Mother Earth is Tapuat (meaning mother and child), symbolized by a form of concentric circles or squares, as shown below. These forms symbolize the cycle of life, the rebirth of the spirit, its earthly path, and, possibly, its return to the spiritual domain. The lines and passages within the "maze" represent the universal plan of the Creator and the path that man must follow to seek enlightenment.

A more imposing definition of Mother Earth might be found in the Hindu goddess Kali. She is the Cosmic Power, representing all of the good and all of the bad in the Universe, combining the absolute power of destruction with the precious motherly gift of creation. It is said that Kali creates, preserves, destroys. Also known as the Black One, her name means "The Ferry across the Ocean of Existence."

The ancient Greeks called their Earth goddess Ge or Gaia. Gaia embodies the idea of a Mother Earth, the source of the living and non-living entities that make up the Earth. Like Kali, Gaia was gentle, feminine and nurturing, but also ruthlessly cruel to any who crossed her. Note that the prefix "ge" in the words geology and geography is taken from the Greek root for Earth.

James Lovelock has taken the idea of Mother Earth one step further and given it a modern scientific twist. (Are our modern Mother Earth "hypotheses" any more refined than ancient Mother Earth myths?). Lovelock defines Gaia "as a complex entity involving the Earth's biosphere, atmosphere, oceans, and soil; the totality constituting a feedback or cybernetic system which seeks an optimal physical and chemical environment for life on this planet." Through Gaia, the Earth sustains a kind of homeostasis, the maintenance of relatively constant conditions.

The truly startling component of the Gaia hypothesis is the idea that the Earth is a single living entity. This idea is certainly not new. James Hutton (1726-1797), the father of geology, once described the Earth as a kind of superorganism. And right before Lovelock, Lewis Thomas, a medical doctor and skilled writer, penned these words in his famous collection of essays, The Lives of a Cell:

"Viewed from the distance of the moon, the astonishing thing about the earth, catching the breath, is that it is alive. The photographs show the dry, pounded surface of the moon in the foreground, dry as an old bone. Aloft, floating free beneath the moist, gleaming, membrane of bright blue sky, is the rising earth, the only exuberant thing in this part of the cosmos. If you could look long enough, you would see the swirling of the great drifts of white cloud, covering and uncovering the half-hidden masses of land. If you had been looking for a very long, geologic time, you could have seen the continents themselves in motion, drifting apart on their crustal plates, held afloat by the fire beneath. It has the organized, self-contained look of a live creature, full of information, marvelously skilled in handling the sun."

Thomas goes even one step further when he writes:

"I have been trying to think of the earth as a kind of organism, but it is a no go...it is most like a single cell."



Courtesy to: http://www.oceansonline.com

Gaia: James Lovelock

"Most of us sense that the Earth is more than a sphere of rock with a thin layer of air, ocean and life covering the surface. We feel that we belong here as if this planet were indeed our home. Long ago the Greeks, thinking this way, gave to the Earth the name Gaia or, for short, Ge. In those days, science and theology were one and science, although less precise, had soul. As time passed this warm relationship faded and was replaced by the frigidity of the schoolmen. The life sciences, no longer concerned with life, fell to classifying dead things and even to vivisection. Ge was stolen from theology to become no more the root from which the disciplines of geography and geology were named. Now at last there are signs of a change. Science becomes holistic again and rediscovers soul, and theology, moved by ecumenical forces, begins to realise that Gaia is not to be subdivided for academic convenience and that Ge is much more than just a prefix."

An analogy to the Gaia Theory

One useful analogy that has been proposed for understanding Gaia is the California redwood tree, Sequoia gigantea. These trees which stand in great groves along the northern coast of California and elsewhere can stand as high as 300 feet and weigh as much as 2000 tons. Some of them are more than 3000 years old.

Redwood trees are like Gaia because 97% of their tissues are dead. The wood of the trunk and the bark of the tree are dead. Only a small rim of cells along the periphery of the trunk is living. The trunk of the tree is similar to the Earth's lithosphere with a thin layer of living organisms spread across its surface. The bark, like the atmosphere, protects the living tissues, and allows for the exchange of biologically important gases, such as carbon dioxide and oxygen.

There is no doubt in my mind that a redwood tree is a living entity. Would you just call the outer layer the redwood tree and the rest of it dead wood? The same holds true for Gaia. While much of the Earth may be considered "non-living", the fact that all of these non-living parts are involved to some extent in living processes suggests that the whole Earth is alive, just like a redwood tree.

Courtsey to: http://www.oceansonline.com