Which revolutionary manufacturing technique did Tesla implement in 2020 at its Gigafactory to reduce the carbon footprint of Model Y production by approximately 30%?

The transportation industry is undergoing massive changes in product design and manufacturing to meet sustainability goals. Major manufacturers are implementing innovative approaches to reduce their carbon footprint while maintaining performance standards. This trivia poll tests your knowledge of recent sustainability initiatives by a major transportation company that made headlines for its ambitious environmental commitments.

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Gigacasting - using massive single-piece die casts to replace dozens of separately manufactured parts
Hydrogen-powered assembly line robots that emit only water vapor as waste
Solar-thermal metal forging that eliminates the need for traditional fossil fuel heating
Bio-composite material replacement program that substituted all plastic components with mushroom-based alternatives