Which innovative sustainable practice was first implemented by London's National Theatre in 2018, revolutionizing eco-friendly performing arts production?

The performing arts industry is increasingly embracing sustainability initiatives to reduce environmental impact while maintaining artistic excellence. From energy-efficient theater lighting to waste-free production designs, sustainability is transforming stages worldwide. Test your knowledge about how performing arts venues and productions are pioneering eco-friendly practices in this challenging trivia question!

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A closed-loop costume recycling program that repurposes 90% of all production textiles
The world's first hydrogen fuel cell power system to run stage lighting during performances
Biodegradable set materials made from mushroom mycelium that decompose after production runs
An audience participation carbon-offset program where ticket sales fund reforestation projects