Related: "Drowning in Light" from a few weeks ago: http://nautil.us/issue/11/light/drowning-in-light http://nautil.us/issue/11/light/drowning-in-light https://n

Related: "Drowning in Light" from a few weeks ago: http://nautil.us/issue/11/light/drowning-in-light http://nautil.us/issue/11/light/drowning-in-light https://news.ycombinator.com/item?id=8344769 https://news.ycombinator.com/item?id=8344769 It makes the compelling argument that people are addicted to light. "Tsao calculates that, as a result, light represents a constant fraction of per capita gross domestic product (GDP) over time; the world has been spending 0.72 percent of its GDP for light for 300 years now. If there are other energy markets that show a constant percentage of GDP expenditure over time, Tsao doesn’t know of them."