At the Gleneagles (2005) and the St. Petersburg (2006) Summits, the Group of Eight (G8) industrialized countries emphasized the need for global cooperation in the field of 33rd G8 summit at Heiligendamm in June 2007, the G8 approved an EU proposal for an international initiative on energy efficiency and decided to explore the most efficient way to promote energy efficiency worldwide, jointly with the International Energy Agency (IEA).