Experts confirm that, since 2000, the availability of petroleum world wide has been constantly decreasing (see, for example, Jörg Schindler and Werner Zittel, ‘World wide trends in energy demands and availability of resources’, Ludwig-Bölkow-Systemtechnik GmbH, Ottobrunn, October 2000; Colin Campbell and Jean Laherre, ‘The end of cheap oil?’, March 1998; Basler Prognos Institut, Peter Hofer, Die ZEIT No 4, 29 October 1998; Ken Chew, IHS-Energy Group, Geneva; L.B. Magoon, ‘Are we running out of oil’, US Geological Survey).
Deskundigen bevestigen dat de mondiale beschikbaarheid van aardolie sinds 2000 gestaag daalt (zie bijv. Jörg Schindler en Werner Zittel, „Weltweite Entwicklung der Energienachfrage und der Ressourcenverfügbarkeit“, Ludwig-Bölkow-Systemtechnik GmbH, Ottobrunn, oktober 2000; Colin Campbell en Jean Laherre, „The end of cheap oil“, maart 1998; Basler Prognos Institut, Peter Hofer, Die ZEIT Nr. 4, 29 oktober 1998; Ken Chew, IHS-Energy Group, Genève; L.B. Magoon, „Are we running out of oil?", US-Geological Survey).