Which major observatory pioneered the first large-scale carbon-neutral certification program for astronomical facilities, reducing its carbon footprint by 85% since 2015?

Major observatories and space agencies have been implementing significant sustainability initiatives to reduce their environmental impact while continuing to explore the cosmos. From renewable energy sources powering telescopes to eco-friendly facility designs, the astronomy industry is working to ensure our exploration of the stars doesn't harm our home planet. Test your knowledge about these important green initiatives in the field of astronomy!

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European Southern Observatory (ESO) in Chile
Keck Observatory in Hawaii
Atacama Large Millimeter Array (ALMA)
Square Kilometre Array (SKA) in South Africa/Australia