Foreword / by George Church
Introduction
Chapter 1: How is de-extinction done?
Chapter 2: Why is de-extinction important?
Chapter 3: What species are good contenders, and why?
Chapter 4: Why recreate the woolly mammoth?
Chapter 5: Can billions of passenger pigeons rebound, and should they?
Chapter 6: How might we regulate this new wilderness?
Chapter 7: Can de-extinction save species on the brink?
Chapter 8: Is some knowledge too dangerous?