Which major observatory became the world's first carbon-neutral astronomical research facility in 2019, implementing a comprehensive sustainability program that includes solar power and hydrogen fuel cells?

The astronomy industry has been making significant strides in sustainability initiatives, with observatories and space agencies implementing eco-friendly practices. From solar-powered telescopes to carbon-neutral space missions, astronomical organizations are working to reduce their environmental footprint while gazing at the stars. Test your knowledge about one of the most innovative sustainability programs in modern astronomy!

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European Southern Observatory (ESO) in Chile
Mauna Kea Observatories in Hawaii
Roque de los Muchachos Observatory in La Palma
W. M. Keck Observatory in Hawaii