Many people have contributed to this book through their discussions and encouragement. David Kent of HarperCollins Canada and Michael Heyward of Text Publishing, Australia, played an important role in convincing me that the book should be written. David Addison and Adepeju Adeosun of the Virgin Earth Challenge provided much encouragement, insight and editorial assistance. Alan Knight, while Director at Business in the Community, provided valuable input, including the suggestion that certain technologies should be called ‘the third way’. Professors David Karoli and John Wiseman of Melbourne University, and Professor Will Steffen, Dr Martin Rice and Amanda McKenzie of the Australian Climate Council all read early drafts and provided invaluable commentary.