Which groundbreaking sustainability initiative was implemented by the European Southern Observatory (ESO) at its Very Large Telescope facility in Chile's Atacama Desert?

The astronomy industry faces unique environmental challenges—from energy-intensive observatories to remote telescope installations in delicate ecosystems. In recent years, major astronomy organizations have launched significant sustainability initiatives to reduce their ecological footprint while advancing our understanding of the cosmos. Test your knowledge about how the astronomy sector is pioneering eco-friendly approaches to studying the stars!

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Installation of a 1.5-megawatt solar farm that provides 20% of the observatory's daytime power needs
Development of hydrogen fuel cells to replace diesel generators for backup power systems
Implementation of a water recycling system that reduced consumption by 85% through atmospheric moisture harvesting
Creation of the world's first carbon-neutral space observation program through extensive carbon offset purchases