Lovelock's originality and breadth of vision, and recognize that his audacious concept has helped to stimulate many new ideas about the Earth, and to champion a holistic approach to studying it". Elsewhere he presents his conclusion "The Gaia hypothesis is not an accurate picture of how our world works". This statement needs to be understood as referring to the "strong" and "moderate" forms of Gaia—that the biota obeys a principle that works to make Earth optimal (strength 5) or favourable for life (strength 4) or that it works as a homeostatic mechanism (strength 3). The latter is the "weakest" form of Gaia that Lovelock has advocated. Tyrrell rejects it. However, he finds that the two weaker forms of Gaia—Coeveolutionary Gaia and Influential Gaia, which assert that there are close links between the evolution of life and the environment and that biology affects the physical and chemical environment—are both credible, but that it is not useful to use the term "Gaia" in this sense and that those two forms were already accepted and explained by the processes of natural selection and adaptation. See also SimEarth – 1990 video game Citations General and cited sources Lovelock, James. The Independent. The Earth is about to catch a morbid fever, 16 January 2006. Lovelock, James (2006), interviewed in How to think about science, CBC Ideas (radio program), broadcast January 3, 2008. Link Further reading External links Gaia as seen through the atmosphere by James Lovelock, published in Biomineralization and Biological Metal Accumulation, 1983, jameslovelock.org D. Abram: The Mechanical and the Organic: On the Impact of Metaphor in Science D. Abram: The Perceptual Implications of Gaia "Lovelock: 'We can't save the planet BBC Sci Tech News Interview: Jasper Gerard meets James Lovelock 1965 introductions Astronomical hypotheses Biogeochemistry Biological hypotheses Climate change feedbacks Cybernetics Earth Ecological theories Evolution of the biosphere Evolution Gaia Meteorological hypotheses Superorganisms Syncretism