קובץ:Hubbert world 2004.png

Hubbert peak graph from public domain document "Strategic Significance of America's Oil Shale Resource Volume I Assessment of Strategic Issues" at http://www.fe.doe.gov/programs/reserves/publications/Pubs-NPR/npr_strategic_significancev1.pdf

Public domain This work is in the public domain because it is a work of the United States federal Government. This applies worldwide. See Copyright.

The above document (along with the famous Hirsch report) has now disappeared from the US Department of Energy website. A copy of the report may be accessed here: http://www.evworld.com/library/Oil_Shale_Stategic_Significant.pdf

The graph was prepared by Werner Zittel and Jorg Schlinder who are not US Government employees. An updated version of the graph can be accessed in the excellent article 'The Countdown for the Peak of Oil Production has Begun – but what are the Views of the Most Important International Energy Agencies' by Zittel and Schlinder: http://www.energybulletin.net/2544.html