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One Measure of Progress

This quote from friend-of-CEI Matt Ridley is too good not to share. Something to be thankful for on Thanksgiving:
Ask how much artificial light you can earn with an hour of work at the average wage. The amount has increased from 24 lumen-hours in 1750 BC (sesame oil lamp) to 186 in 1800 (tallow candle) to 4,400 in 1880 (kerosene lamp) to 531,000 in 1950 (incandescent light bulb) to 8.4 million lumen-hours today (compact fluorescent bulb). Put it another way, an hour of work today earns you 300 days’ worth of reading light; an hour of work in 1800 earned you ten minutes of reading light. Matt Ridley, The Rational Optimist, p. 20.