This book explains the pattern of energy consumption across the globe. Chapters 2, 3 and 4, examine respectively the energy-income relationship for developing and developed countries, decomposition analysis of energy consumption, and the relationship of energy intensity with per capita income to determine the possible existence of threshold levels of per capita income at which the nature of relationship is altered. The findings from chapter 2 confirm the presence of a positive relationship between energy consumption per capita and real GDP per capita for developing and developed countries.