Ed. Note: Also see Part I (on wind); Part II (on water, biomass, and geothermal); and Part III (on coal) in this series. It is wholly a confusion of ideas to suppose that the economical use of fuel is equivalent to a diminished consumption. The very contrary is the truth. As a rule, new modes … Continue reading W. S. Jevons on Energy Efficiency (Memo to Biden, Part IV)