Which major observatory became the world's first carbon-neutral astronomical research facility in 2020, implementing a comprehensive sustainability program including solar power and waste reduction?

The astronomy industry has increasingly embraced sustainability initiatives as observatories and space agencies work to reduce their environmental impact. From energy-efficient telescopes to carbon-neutral research facilities, astronomy is looking toward the stars while keeping Earth in mind. Test your knowledge about the innovative sustainability practices being implemented by major astronomical organizations and how they're changing the way we explore the cosmos.

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European Southern Observatory (ESO) in Chile
Mauna Kea Observatories in Hawaii
Atacama Large Millimeter Array (ALMA)
Green Bank Observatory in West Virginia