Energy Sources World energy demand by source Historica and projected world energy demand,by fuel source,in quadrillion BTUs,1990-2030 250 200 150 100 50 0 ◆-Oil-Natural Gas-Coal米-Nuclear。-Renewables Note:Asterisks denote projedted figures. Source:"International Energy Outlook 2008,"June 2008,Energy In frmation AdministrationEnergy Sources