I should like to thank the usual suspects who have made the completion of this book possible: Nick Scarle for drawing the diagrams; Andrew Mould for taking on board a 'research monograph' with limited sales potential; Anja Scheffers for kindly letting me use her photographs; and the University of Manchester for granting me a semester's research leave. As always, special thanks go to my wife, and to my two youngest children for letting me use my PC between sessions of Battle for Middle-Earth, Civilization, and Myst V: End of Ages.

The author and publisher would like to thank the following for granting permission to reproduce material in this work. Full acknowledgements are given in the corresponding figure captions: Don L. Anderson; Blackwell Publishing; Lunar and Planetary Science Institute, Houston, Texas; Macmillan Publishers Ltd; Elsevier; Paul F. Hoffman; Candace O. Major; Anja Scheffers; University of Chicago Press; AAAS; William McGinnis; The Paleontological Society; Springer Science and Business Media and Axel Kleidon.


Every effort has been made to contact copyright holders for their permission to reprint material in this book. The publishers would be grateful to hear from any copyright holder who is not acknowledged and will undertake to rectify any errors or omissions in future editions of this book.

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