Earth -- Contents -- Preface -- Acknowledgments -- A Note on Related Reading -- Part I. Earth Present: The Third Planet -- 1. The Third Planet -- 2. The Home Planet -- 3. The Rocky Planet -- 4. The Blue Planet -- 5. The Veiled Planet -- 6. The Hazardous Planet -- 7. The Ancient Planet -- 8. The Bountiful Planet -- 9. The Finite Planet -- Part II. Earth Past: The Changing Planet -- 10. The Singular Planet -- 11. The Uninhabitable Planet -- 12. The Living Planet -- 13. The Warming Planet -- 14. The Polluted Planet -- 15. The Crowded Planet -- Part III. Earth Future: The Sustainable Planet -- 16. The Sustainable Planet -- 17. Water as Sustenance -- 18. Air as Sustenance -- 19. Soil as Sustenance -- 20. Food as Sustenance -- 21. Energy as Sustenance -- 22. Materials as Sustenance -- 23. Prospects for Sustenance -- 24. Policies for Sustenance -- Epilogue -- Related Reading -- Index.