ALT The ALMA Observatory is privileged to conduct scientific observations of the Universe under the pristine skies of the Atacama Desert in northern Chile, benefiting from one of the highest-quality astronomical sites on Earth. While its high-altitude, isolated location, and focus on radio astronomy shield it from many impacts of light pollution, preserving dark skies is a global challenge that affects all observatories and humanity’s ability to explore the universe. ALMA and its partners AUI/NRAO and NAOJ support ESO in addressing the growing threat of light pollution near the Paranal Observatory and the ELT in the Antofagasta Region in Chile. Their commitment highlights the urgency of ensuring the long-term sustainability of astronomical observations in Chile. ALMA stands in solidarity with these efforts, reaffirming the importance of collaboration in protecting this invaluable natural resource.