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תפוקת הנפט הגלובאלית תגיע לשיאה ב- 2005, כותב קנת ס. דפייס, פרופסור אמריטוס לגיאולוגיה באוניברסיטת פרינסטון. הוא סבור שיש חשיבות רבה למועד בו תחל הירידה בתפוקה, משום שפרק זמן של 4 – 5 שנים אינו מספיק לפיתוח מקורות הספקה חלופיים.
