There are at least two forms of the Gaia hypothesis: The Weak Gaia Hypothesis: The ecosphe

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There are at least two forms of the Gaia hypothesis: The Weak Gaia Hypothesis: The ecosphere of the earth has a suite of feedback mechanisms which tend to result in some degree of homeostasis. I.e., these feedback mechanisms tend to keep the global mean temperature, concentrations of various gases, etc. at more or less constant levels. These feedback mechanisms cause the ecosphere to act in ways analagous to the functioning of living organisms. The Strong Gaia Hypothesis: The earth is a living organism.

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