Which revolutionary sustainability initiative was implemented by the European Southern Observatory (ESO) at its Paranal Observatory in Chile to reduce environmental impact?

The astronomy industry has been making significant strides toward sustainability in recent years. From eco-friendly observatory designs to energy-efficient telescope technologies, astronomical organizations are working to reduce their environmental footprint while still advancing our understanding of the cosmos. This poll tests your knowledge about one of the most innovative sustainability initiatives in modern astronomy. How well do you know the green side of stargazing?

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Installation of the world's largest solar farm specifically designed to power astronomical instruments, providing 80% of the observatory's energy needs
Development of a closed-loop water recycling system that reduced water consumption by 65% in one of Earth's driest regions
Implementation of the first carbon-negative telescope, which captures more carbon through integrated algae systems than it produces through operations
Creation of biodegradable telescope mirror coatings that eliminate toxic waste from traditional aluminum recoating processes