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The Gaia hypothesis asserts that Earth’s temperature and atmospheric composition are actively controlled by the activities of organisms. This planetary hypothesis states that the biogeochemical work of organisms acts to regulate the Earth’s conditions including the composition of the Earth's atmosphere, temperature and oxidation state. Perturbations caused by asteroids, comets, volcanoes, or other disturbances, are modified by the activities of life, working to re-establish the far from equilibrium conditions which sustain ecosystem growth and development. In simple terms, the responses of life’s processes to disturbances tend to regulate the state of the Earth's conditions to favor life.