The nocturnal signature of the planet is intensifying, though the glow is no longer spreading with the predictable uniformity of previous decades. According to a study by NASA-funded researchers at the University of Connecticut, Earth’s artificial brightness saw a net increase of 16 percent between 2014 and 2022. While the trend toward a brighter world remains intact, the data reveals a new era of volatility in how and where that light is emitted.
To reach these conclusions, researchers analyzed more than 1.1 million satellite images taken over a nine-year period. The resulting map of global luminosity reflects more than just urban expansion; it serves as a sensitive barometer for human disruption. The steady climb of previous eras has been replaced by a more erratic pattern, dictated by the localized shocks of the COVID-19 pandemic, shifting economic fortunes, and a patchwork of new regulations aimed at curbing light pollution.
This volatility suggests that the "Anthropocene glow" is becoming as much a reflection of policy and crisis as it is of development. In some regions, economic stagnation or stringent environmental laws have dimmed the lights, while in others, rapid industrialization continues to push back the dark. The study underscores the complexity of managing light as a pollutant, noting that even as some cities darken their streets to protect local ecosystems, the global aggregate continues to rise.
With reporting from The Guardian Science.
Source · The Guardian Science
