Which sustainable innovation has been widely adopted by major theaters and performing arts centers to significantly reduce their environmental footprint?

The performing arts industry has been making significant strides toward sustainability in recent years. From eco-friendly set designs to carbon-neutral productions, theaters and performance venues worldwide are embracing green practices. This trivia question tests your knowledge about an innovative sustainable practice that has been transforming how performing arts venues approach their environmental impact. Can you identify the correct sustainable innovation from the options below?

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LED stage lighting systems that reduce energy consumption by up to 80% compared to traditional lighting
Biodegradable ticket stubs made from algae that can be planted after use
Acoustic amplification systems that use zero electricity through innovative architectural design
Costume departments exclusively using AI-generated virtual costumes projected onto performers