Which major observatory first achieved carbon-neutral status in 2020 through a combination of renewable energy implementation and carbon offset programs?

The astronomy industry has seen significant sustainability initiatives in recent years as observatories and space agencies work to reduce their environmental impact while continuing to explore the cosmos. From solar-powered telescopes to carbon-neutral space missions, organizations are finding innovative ways to make stargazing more eco-friendly. Test your knowledge about one of the most significant green initiatives in modern astronomy!

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European Southern Observatory (ESO) in Chile
Mauna Kea Observatories in Hawaii
NASA's Jet Propulsion Laboratory in California
Square Kilometre Array in South Africa and Australia