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Gaia hypothesis  search
RTbiochemistry
 biologic evolution
 biosphere
 climate
 Earth
 ecology
 ecosystems
 environmental geology
 geochemical cycle
 greenhouse effect
 paleoatmosphere
 planetology
SNOr theory that the presence of living organisms on a planet leads to major modifications of planetary physical and chemical conditions, and that following the establishment of life, the climate and major biogeochemical cycles are mediated by living organi