What is the hypothesis of Gaia
The Many Gaian Hypotheses Jim Kirchner (see "suggested readings") argues that there are really many Gaian hypotheses. Influential Gaia, the weakest of the hypotheses, asserts that biota have a substantial influence over certain aspects of the abiotic world, such as temperature and the composition of the atmosphere.
Gaia philosophy (named after Gaia, Greek goddess of the Earth) ..
Two models emerge: The model that life influences planetary processes (i.e., it has a substantial effect on abiotic processes) has become known as the weak Gaia hypothesis. This model is widely supported.
Summary The Gaia Hypothesis states that life on earth controls the physical and chemical conditions of the environment (the biotic controls the abiotic) The hypothesis was formulated by James Lovelock and Lynn Margulis The hypothesis points to stable conditions, such as oxygen levels and climate, as evidence that living organisms maintain a life-sustaining environment The hypothesis has been defined and argued in numerous ways, and has as many critics as adherents.