Which major observatory was the first to be certified as carbon-neutral in 2018, pioneering sustainable practices in astronomy through 100% renewable energy use and innovative waste reduction systems?

The astronomy industry has been making significant strides in sustainability initiatives over the past decade. From energy-efficient observatories to carbon-neutral telescope operations, astronomical organizations worldwide are working to reduce their environmental footprint while continuing to explore the cosmos. Test your knowledge about how the astronomy industry is embracing sustainability in its operations, equipment, and practices.

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European Southern Observatory (ESO) in Chile
W. M. Keck Observatory in Hawaii
Thirty Meter Telescope (TMT) in California
Atacama Large Millimeter Array (ALMA) in Chile