NASA has released new global maps showing how artificial nighttime lighting has changed between 2014 and 2022. The data, collected by the Black Marble program using specialized satellite sensors, reveals complex patterns of brightening and dimming across the world.
Core Findings
- Global Trends: Nighttime radiance increased by 34% worldwide, while dimming offset it by 18%. Researchers noted intensified volatility in human nighttime activity, driven by industrial shifts, policy changes, and crises.
- Regional Variations: The U.S. West Coast grew brighter due to population growth, while the East Coast dimmed because of energy-efficient lighting and economic restructuring. Europe saw dimming linked to energy conservation, and Ukraine experienced a sharp drop in 2022 due to the war. China and northern India brightened as urban development expanded.
Key Drivers
- Technology: The shift to LED lighting contributed to dimming in regions like the UK and France, where nights grew 22% and 33% darker, respectively.
- Policy and Crises: COVID-19 lockdowns and the Ukraine war caused rapid dimming in affected areas. Local and national efforts to reduce light pollution also played a role.
- Urbanization: Rapid urban development in China and India led to increased brightness, while Europe’s dimming reflected energy conservation measures.
Implications
The findings provide insights into urban evolution, energy transitions, and ecological consequences of artificial lighting. The data challenges the assumption that global nighttime brightness is uniformly increasing, highlighting instead a dynamic interplay of local and global factors.