LEDs: How a little blue light changed the world

The invention of the blue light-emitting diode (LED) serves as a lens to examine the Jevons Paradox, which posits that technological efficiency gains often lead to increased rather than decreased resource consumption. While early environmental models assumed that more efficient lighting would reduce energy demand, humanity’s insatiable desire for light—manifested in everything from stadium wristbands to ubiquitous digital displays—initially caused energy usage to skyrocket. However, recent data from high-income nations indicates that LEDs have finally broken this cycle, with electricity consumption for lighting dropping by 55% over the last decade. This shift suggests that while technological progress frequently triggers a "backfire effect" in sectors like computing and transportation, LEDs represent a rare, successful instance where innovation effectively decouples human development from environmental degradation, offering a nuanced perspective on the feasibility of global net-zero goals.