Eco Stuff
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The study of planetary habitability is partly based upon extrapolation from knowledge of the Earth 's conditions, as the Earth is the only planet currently known to harbour life The Gaia hypothesis , also known as Gaia theory or Gaia principle , proposes that organisms interact with their inorganic surroundings on Earth to form a self-regulating , complex system that contributes to maintaining the conditions for life on the planet. Topics of interest include how the biosphere and the evolution of life forms affect the stability of global temperature , ocean salinity , oxygen in the atmosphere and other environmental variables that affect the habitability of Earth.
