"Tyrrell's story is very informative and the reader will learn many fascinating stories of an organism's adaptation to an environment (rather than an environment conforming to an organism's need)."
Jonathan DuHamel, Arizona Daily Independent "A systematic, dispassionate, retrospective examination of Gaia... Tyrrell makes it very clear where he stands on Gaia, but the path of his journey is well reasoned
not a ... Read morediatribe."
William Schlesinger, Nature Climate Change "It is timely to present a systematic review of how Gaia theory looks in the light of ... new information. Not too well is Toby Tyrrell's conclusion in this clear summary of the evidence to date... Persuasive."
Jon Turney, Times Higher Education "In On Gaia: A Critical Investigation of the Relationship between Life and Earth, Dr. Toby Tyrrell, for the first time, conducts a lengthy analysis of the scientific data for and against the Gaia Hypothesis. He concludes that the Gaia Hypothesis does not have enough scientific data to support it. He write eloquently, clearly, and succinctly describing how the Gaia Hypothesis lacks sufficient scientific evidence... A fair and reflective analysis."
Gabriel Thoumi, MongaBay.com "Tyrrell examines alternative arguments about the long-term characteristics of the Earth, considering geological and coevolutionary effects. He provides a detailed examination of how and why the environment cannot be affected by natural selection and how diverse physical factors affect living things... Overall, a useful examination of the changing nature of Earth and the biologic/physical factors that affect the planet's organisms."
Choice "His theory is not as grandiose as Gaia, but it is far more compelling. The conclusion is worth reading by itself if you are pushed for time, but for those who really want a good insight into Gaia in the context of natural systems, I would recommend reading the whole book."
Gillian Gibson, Environmentalist "If you've had your curiosity piqued by the Gaia Hypothesis before, you'll appreciate this well-organized and comprehensive assessment of it. Tyrrell doesn't have an axe to grind, and his discussion is fair and focused on the evidence. If you want to grapple with Gaia, this book is a good way to do it."
Scott K. Johnson, ArsTechnica "One third of this well argued book consists of end notes, many of which are as readable as the main text. By questioning the arguments for and against the Gaia hypothesis, Tyrrell has done a great service to enriching the ongoing discourse on making our planet hospitable for all life forms, now and in the future."
Sudhirendar Sharma, Cover Drive "On Gaia is a rewarding read for the knowledgeable reader. The book is an easy read and accessible to a broad audience. Unlike some science books intended for popular audiences, the book is sophisticated enough to keep the interest of graduate students."
GeoQ "It is ... Valuable for a variety of reasons: as a good natural history brief; as a good introduction to modern ecology (the one that considers the biota as a whole); and as a cautious reflection on what makes a theory gain or lose respectability. Therefore, it will be useful at different academic levels, from teaching at secondary school (it is an excellent starting point for serious debate) to highly specialized climate scientists."
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