Earth's Brightness Increases by 16% Over 8 Years, Study Reveals Volatile Trends

A recent study funded by NASA has revealed that the Earth continues to get brighter every year, with a 16% increase in artificial light between 2014 and 2022. However, the progression has become increasingly volatile due to factors such as Covid-19, regulations on light pollution, and a faltering global economy.

The study, conducted by researchers at the University of Connecticut (UConn), analyzed over 1.1 million satellite images taken over a nine-year period. The findings indicate that while some parts of the planet became dimmer, helping to offset a 34% overall rise in global radiance, others experienced significant brightening.

Europe dimmed significantly due to efficiency regulations, while Venezuela lost more than 26% of its night-time light due to economic collapse. The Covid-19 pandemic also had an impact, with lockdowns, reduced industrial activity, and decreased tourism causing dimming in many areas.

In contrast, Asia continued to lead all regions in brightening, with night-time light surging in China and northern India along with urban development. The study also revealed that energy conservation measures coincided with reduced light pollution in Paris and throughout France, which experienced a 33% dimming.

The researchers used satellite images taken at approximately 1:30 am local time every day of the nine-year study period by NASA's Visible Infrared Imaging Radiometer Suite. The study's co-author, Zhe Zhu, described the experience as "like watching the heartbeat of the planet".

The findings have significant implications for energy security and environmental sustainability. As Deborah Gordon, senior principal of the Rocky Mountain Institute's climate intelligence program, noted, "Understanding where gas is being wasted around the globe, and to have this data be public, is huge for energy, and economic and environmental security."