[3] In 1950, Fuller revised his calculations upwards and estimated that, on average, each human holds 38 energy slaves.
An exhibition in Switzerland in 2001 presents a popularised definition of "energy slaves" based on the work carried out by Tourane Corbière-Nicollier under the supervision of Olivier Jolliet of the EPFL-GECOS laboratory in Lausanne.
The definition given is ː "The energy slave is a unit of measurement that allows us to better understand and evaluate the consequences of our life choices.
In France, the term energy slave is used by Jean-Marc Jancovici and has been studied by the historian Jean-François Mouhot.
Jean-Marc Jancovici draws the following conclusion: "in a democracy: it is not only the way of life of Mr. Dassault or the Queen of England [sic] that has become unsustainable if we put ourselves in the realm of physics, but that of each and every one of us, including factory workers, cleaners and supermarket cashiers."