Something that is often lost in the discussion of energy efficiency and conservation is the fact that energy usage is not a bad thing at all. Of course, it is reasonable to worry about the sustainability of our current energy economy and to try to diversify our energy sources to improve the robustness of our energy supply. But, when one thinks about such issues, it is important to remember that energy usage is crucial to our quality of life, and not just superficial comforts…
However, the connection between energy consumption and measures of quality of life is not an easy one to tease apart. I’ll try to at least provide some fodder to make you think about it here, though…
How much does increasing energy consumption improve quality of life?
First, quality of life, as measured via the human development index, versus the annual per capita electricity usage for a wide variety of countries.
And, second quality of life, as measured by life expectancy, versus per capita energy consumption
In both of these, the first-order message is that there is a strong correlation between energy usage and quality of life, and the fact that you see a strong correlation even in the case of life expectancy highlights that the relationship is deeper than superficial things such as the comforts provided by personal electronics, bigger houses, etc.
Of course, one should be careful reading too much into these plots. Yes, increased energy usage is correlated strongly with improved quality of life. But, that doesn’t mean that conservation of energy leads to a decreased quality of life.
One nice illustration of this is the fact that in the US per capita energy consumption decreased between 1980-2006, while the life expectancy rose. But, the US is an outlier in this regard, as you can see in the following plot:
For me, studies such as this drive home the need for diversification of the energy landscape through renewables. Of course, we should eliminate inefficiencies in our energy usage. But, it is unrealistic to expect such efficiency improvements to stem the growth of energy consumption significantly. One of the wins of renewables is that that they can allow society to continue to have large growth in energy consumption for the foreseeable future — and this continued growth in consumption is necessary for significant quality-of-life improvements (including life-expectancy improvements) in large parts of the globe.