This is the first post of a series I intend to write on the energy efficiency theme, of which this one is a general introduction, and the following ones will keep going into more specific matters and tips.
Historically, Japanese overpopulation together with its traditional Confucianism principles and lack of basic resources has turned Japan into one of the most, if not the most, efficient countries in the modern world. There are obviously many different ways of measuring macro-efficiency, but I personally tend to prefer economies energy intensity (the GDP/Energy ratio) to showcase it. In the graph below you can see how much energy did each country use to produce a given amount of wealth when compared with Japan during 2009.
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