The new world atlas of artificial night sky brightness presents a comprehensive analysis of light pollution, revealing that over 80% of the world and more than 99% of the U.S. and European populations live under light-polluted skies. The Milky Way is hidden from more than one-third of humanity, including 60% of Europeans and nearly 80% of North Americans. The atlas, computed using high-resolution satellite data and precision sky brightness measurements, shows that 23% of the world's land surfaces between 75°N and 60°S, 88% of Europe, and almost half of the United States experience light-polluted nights. The study highlights the global impact of light pollution on astronomy, ecology, health, and land use, emphasizing the need for immediate action to mitigate its effects. The atlas provides a valuable resource for researchers and policymakers to address this pervasive environmental issue.The new world atlas of artificial night sky brightness presents a comprehensive analysis of light pollution, revealing that over 80% of the world and more than 99% of the U.S. and European populations live under light-polluted skies. The Milky Way is hidden from more than one-third of humanity, including 60% of Europeans and nearly 80% of North Americans. The atlas, computed using high-resolution satellite data and precision sky brightness measurements, shows that 23% of the world's land surfaces between 75°N and 60°S, 88% of Europe, and almost half of the United States experience light-polluted nights. The study highlights the global impact of light pollution on astronomy, ecology, health, and land use, emphasizing the need for immediate action to mitigate its effects. The atlas provides a valuable resource for researchers and policymakers to address this pervasive environmental issue.