This book documents the key scientific discoveries made by earth scientists fascinated with exposing the deepest secrets of our changing climate through time. It recounts how their ideas were influenced by the development of thinking outside geology for example by the discovery of greenhouse gases by physicist John Tyndall, and the elucidation of how regular changes in the Earths orbit affected climate by engineer Milutin Milankovitch. The book is not a classic palaeoclimatological text including arrays of methods and their shortcomings and subdivided into geological periods and epochs from 4 billion years ago to the present. It focuses on describing the greenhouse and icehouse worlds of the past 450 million years since land plants emerged, and ignores major earlier glaciations like that of Snowball Earth, which occurred around 600 million years ago in a world free of land plants. It describes the evolution of thinking in palaeoclimatology and introduces the main players in the field and how their ideas were received and, in many cases, subsequently modified even the gods have feet of clay. It records the arguments and discussions about the merits of different ideas along the way. It also includes several notes made from my own personal involvement in palaeoclimatological and palaeoceanographic studies, and from my experience of working alongside and publishing with several of the major players in these fields in recent years. It is in many ways an expansion in book form of the statement on climate change of the Geological Society of London, which I helped to write, and which has been widely used by others. It reflects my own experiences for example of working on past climate change as a marine geologist/geochemist; of being the Director of a major oceanographic institute with responsibility for physical, chemical and biological oceanographers working on climatic and environmental change; of supplying oil companies with advice on past climate change as the basis for exploring for the possible source rocks of oil; of working with UNESCOs Intergovernmental Oceanographic Commission and the World Meteorological Organization on the contribution of the oceans to modern climate change; of being a  member of the steering committee for the Global Climate Observing System; of supervising the development of multidisciplinary studies of climate change and its effects on all timescales from the geological to the modern and into the future in Antarctica; and of providing advice on climate change to bodies such as UNESCOs Intergovernmental Oceanographic Commission, the World Meteorological Organization, and the Parties to the Antarctic Treaty.

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