Which major observatory was the first to achieve carbon-neutral operations through a comprehensive sustainability program?

Modern astronomy facilities have enormous environmental footprints—from remote observatories requiring extensive infrastructure to energy-intensive supercomputers processing cosmic data. As the climate crisis intensifies, the astronomy community has been implementing innovative sustainability initiatives to reduce their impact while continuing to explore the universe. Test your knowledge about how the astronomy industry is working toward environmental responsibility!

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European Southern Observatory (ESO) in Chile
W. M. Keck Observatory in Hawaii
Thirty Meter Telescope (TMT)
Square Kilometre Array (SKA) in Australia and South Africa