Which major astronomical observatory pioneered the world's first carbon-neutral certification for a professional research telescope facility through its comprehensive sustainability program?

The astronomy industry has been making significant strides in sustainable practices, particularly in observatory operations and telescope manufacturing. As observatories consume substantial energy for climate control, computing power, and instrument operation, many major facilities have implemented innovative sustainability initiatives. Test your knowledge about how the stars of astronomy are becoming greener!

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European Southern Observatory (ESO) in Chile's Atacama Desert
Mauna Kea Observatories in Hawaii
McDonald Observatory in Texas
W.M. Keck Observatory on Mauna Kea