Which major observatory pioneered a comprehensive sustainability initiative that reduced its carbon footprint by 80% while maintaining full research capabilities?

Test your knowledge about sustainability initiatives within the astronomy industry! As observatories and space agencies work to reduce their environmental footprint, innovative approaches are reshaping how we explore the cosmos. From energy-efficient telescopes to carbon-neutral launch programs, astronomical organizations are pioneering ways to study the stars while preserving our planet. How much do you know about these earth-friendly approaches to space exploration?

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The European Southern Observatory (ESO) in Chile with its 'GreenLight' program
The Keck Observatory in Hawaii with its 'SustainaStar' initiative
The Square Kilometre Array (SKA) in Australia/South Africa with its 'ZeroImpact' design
NASA's Green Space Program at the Goddard Space Flight Center