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The Gaia hypothesis is an ecological hypothesis proposing that the biosphere and the physical components of the Earth (atmosphere, cryosphere, hydrosphere and lithosphere) are closely integrated to form a complex interacting system that maintains the climatic and biogeochemical conditions on Earth in a preferred homeostasis. Originally proposed by James Lovelock as the earth feedback hypothesis,Lovelock, James (2001), "Homage to Gaia: The Life of an Independent Scientist", (Oxford University Press) it was named the Gaia Hypothesis after the Greek supreme goddess of Earth.http://www.ecolo.org/lovelock/lovelock-online_chat-00.htm The hypothesis is frequently described as viewing the Earth as a single organism. Lovelock and other supporters of the idea now call it Gaia theory, regarding it as a scientific theory and not mere hypothesis, since they believe it has passed predictive tests.Lovelock, James (2007), "The Revenge of Gaia: Earth's Climate Crisis & The Fate of Humanity" (Basic Books)

Gaia philosophy (named after Gaia, Greek goddess of the Earth) is a broadly inclusive term for related concepts that living organisms on a planet will affect the nature of their environment in order to make the environment more suitable for life. This set of theories holds that all organisms on an extraterrestrial life-giving planet regulate the biosphere to the benefit of the whole. Gaia concept draws a connection between the survivability of a species (hence its evolutionary course) and its usefulness to the survival of other species.

While there were a number of precursors to Gaia theory, the first scientific form of this idea was proposed as the Gaia hypothesis by James Lovelock, a UK chemist, in 1970. The Gaia hypothesis deals with the concept of homeostasis, and claims the resident life forms of a host planet coupled with their environment have acted and act as a single, self-regulating system. This system includes the near-surface rocks, the soil, and the atmosphere. While controversial at first, various forms of this idea have become accepted to some degree by many within the scientific community (See Amsterdam declaration on Global Change). These theories are also significant in green politics.