Which major astronomical facility has pioneered sustainability by becoming the world's first carbon-neutral observatory, implementing comprehensive renewable energy systems and waste reduction programs?

Modern astronomical observatories face unique environmental challenges. From light pollution to energy consumption, observatories worldwide are implementing innovative sustainability initiatives to reduce their environmental footprint while maintaining scientific excellence. This trivia question explores how major observatories are pioneering sustainable practices in their quest to study the cosmos. Test your knowledge about the intersection of astronomy and environmental responsibility!

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European Southern Observatory (ESO) in Chile
Keck Observatory in Hawaii
Very Large Telescope Array (VLT) in Arizona
Five-hundred-meter Aperture Spherical Telescope (FAST) in China