Which of these sustainability initiatives has become the most widely adopted 'green standard' among major international observatories built since 2020?

Astronomical research and observatories have a significant environmental footprint, from remote mountain facilities to energy-intensive supercomputers processing cosmic data. In recent years, the astronomy community has been implementing innovative sustainability practices to reduce their impact on our planet while continuing to explore the universe. Test your knowledge about the latest eco-friendly initiatives in modern astronomy!

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LEED Platinum certification requiring 100% carbon neutrality through on-site renewable energy generation
The Astronomy Carbon Reduction Initiative (ACRI) requiring digital-only observation methods to eliminate travel emissions
The StellarShield program requiring special coatings on all telescopes to prevent light reflection and reduce light pollution
The Cosmic Conservation Compact requiring observatories to operate only during renewable energy peak production hours