Please will the author feel no offense as I use the above reaction to make an important point.
Efficiency is a process which needs a object or goal.
As the above dislike points out it is possible to have as an objective the killing of half of the world's population. Efficiency can also have the object of financial independence, or as in the case of those participating in this forum the object is the good and happy life for each and every human. The word, efficiency, carries with it the objective of those who advocate it. Let us capture this powerful word. For me, efficiency for creation of good life means the minimum use of the short Earth resources to create maximum good life.