Vaclav Smil,  Energy at the Crossroads: Global Perspectives and Uncertainties
Cambridge, MA: MIT Press, 2003
ISBN 0262194929

Chapter 6
Page 317

Anybody even cursorily familiar with the current state of principal energy conversion techniques appreciates the enormous opportunities for using fuels and electricity more efficiently…. Whatever the future gains may be, the historical evidence is clear: Higher efficiency of energy conversions leads eventually to higher, rather than lower, energy use, and eventually we will have to accept some limits on the global consumption of fuels and electricity.