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GAIA HYPOTHESIS

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					       GAIA HYPOTHESIS
    Created by James
    Lovelock in 1969
    (but not published
    until 1979)

   Named after the
    Greek Goddess
    Gaia who was the
    Earth Goddess
 Hypothesis: that the entire mass of
 living matter on Earth (the
 biosphere) functions as a single and
 vast superorganism that actively
 modifies its planet to produce the
 environment that suits its needs.

 Properlydefined as "hospitality" as a
 full homeostasis (ability to self
 regulate the internal environment)
  4 factors that work together

Biosphere

Oceans

Atmosphere

Soil
     3 Ways Earth regulates itself
1.   Surface Temperature – has remained
     constant despite the energy increase by the Sun


2.   Atmospheric Composition – remains
     constant even though it should be unstable


3.   Ocean Salinity – remains constant despite
     the fact that river salts should have raised the
     ocean salinity much higher
                 Daisyworld
   Lovelock used this computer simulation to
    demonstrate the hypothesis

   Hypothetical world orbiting a sun whose
    temperature is slowly increasing in the
    simulation

   Planet has two different species of daisy
    as its only life form: black daisies and
    white daisies

   http://library.thinkquest.org/C003763/flas
    h/gaia1.htm

				
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posted:2/23/2012
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