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

The astronomy industry faces unique sustainability challenges due to the energy-intensive nature of observatories, data centers, and space operations. Leading organizations are implementing innovative solutions to reduce their environmental footprint while advancing our understanding of the cosmos. Test your knowledge about sustainability initiatives in modern astronomy and space exploration!

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Solar power systems that provide 100% of daytime electricity needs for observatory operations
Hydrogen fuel cells that power all nighttime telescope operations and imaging equipment
Water recycling technology that eliminates the need for external water supplies in the desert environment
Carbon capture systems that achieve negative emissions, offsetting all operational carbon output