Which sustainability initiative has been successfully implemented at the European Southern Observatory's Very Large Telescope (VLT) facility in Chile's Atacama Desert?

Modern astronomical observatories require significant resources to operate, from energy for massive telescopes to maintaining remote facilities. With growing environmental concerns, the astronomy industry has been implementing various sustainability initiatives. This poll tests your knowledge about how major observatories are addressing their environmental impact while continuing to explore the cosmos.

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A floating solar panel array that provides 40% of the observatory's power needs while conserving scarce desert water resources
A hydrogen fuel cell system that eliminates carbon emissions by using locally-sourced hydrogen extracted from underground reservoirs
A hybrid solar-diesel power system that reduces carbon footprint by 1,400 tons of CO2 annually and saves approximately 500,000 liters of fuel
Wind turbines specifically designed to create minimal air turbulence, preventing interference with astronomical observations while generating clean energy