Fig. 4: Temporal trends of global and country- and territory-level ALAN radiance change from 2014 to 2022.
From: Satellite imagery reveals increasing volatility in human night-time activity
a, Line plots showing the global trends in annual ALAN radiance change: total net radiance change (left); total brightening radiance change (middle); and total dimming radiance change (right). The dots show the corresponding global annual sum of ALAN radiance changes from 2014 to 2022, the solid lines show the overall Sen’s slope trends and the shaded areas represent their 95% CI. b. Bivariate map showing the trends in annual radiance change of brightening (increasing compared with decreasing) and trends in annual radiance change of dimming (increasing compared with decreasing). Countries and territories with a trend equal to zero are not shown. Map colours represent the directions of trends in annual radiance change of brightening and dimming, the stripe texture indicates regions with statistically significant trends in brightening changes and the dot texture indicates regions with statistically significant trends in dimming changes (Sen-slope, Mann–Kendall P < 0.05). Numbers in the legend show the total number of countries and territories with different trends in brightening and dimming radiance changes. Basemap in b is adapted from the World Continents Layer from Esri.
