In public lectures that I give about global energy, I often note that since the writing of A Cubic Mile of Oil the global reserves of oil have increased, not decreased, despite the fact that in the intervening time (i.e., between 2007 and 2013) the world has consumed about 7.5 cmo. In this post I want to dig deeper and look at the changes that have brought about this paradox, and what it means for Peak Oil. As I explain in the book, reserves have a special meaning refer to those geologic accumulations that can be economically extracted with the current technology. With the development of technology and/or changes in the price of oil, geologic accumulations that were once only part of the larger resource base may get transferred to the reserves. Focusing only on the reservesis apt to give a wrong impression about the total availability of oil. […]