Which major astronomical facility was the first to be certified as carbon-neutral through a combination of on-site renewable energy and carbon offset programs?

Modern astronomy observatories consume significant resources, from energy-intensive supercomputers to remote facilities on pristine mountaintops. As climate concerns grow, the astronomy community has been developing innovative approaches to reduce their environmental footprint. Test your knowledge about sustainability initiatives in astronomical research and how observatories around the world are working toward greener operations.

This is a live public trivia poll on AIPolls.Net. Vote and see real-time results.

European Southern Observatory (ESO) in Chile
W. M. Keck Observatory in Hawaii
Green Bank Observatory in West Virginia
Atacama Large Millimeter Array (ALMA) in Chile