Which sustainability initiative has been widely adopted by major sports stadiums to significantly reduce plastic waste?

Major sporting events can generate significant environmental impacts, from waste and carbon emissions to water usage. In recent years, sports organizations have been implementing innovative sustainability initiatives to reduce their ecological footprint. This trivia question tests your knowledge about one of the most significant sustainability developments in the sports industry. How well do you know the eco-friendly practices transforming the world of athletics?

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Implementation of aluminum cups instead of single-use plastic cups
Replacement of all printed tickets with digital-only entry systems
Installation of solar panels on stadium roofs
Creation of stadium gardens that supply produce for concession stands