Which innovative sustainable practice was first introduced by the National Theatre in London as part of their 'NT Green' program?

The performing arts industry is increasingly focusing on sustainability initiatives. From eco-friendly stage designs to carbon-neutral productions, theaters and performance venues worldwide are reimagining how shows can reduce their environmental impact while maintaining artistic excellence. Test your knowledge about the intersection of sustainability and performing arts in this challenging trivia question!

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Implementation of LED stage lighting systems that reduced energy consumption by 70%
Creation of biodegradable costumes made from algae-based textiles
Development of sound systems powered entirely by kinetic energy from audience movements
Installation of rainfall collection systems to supply water effects for productions