Which sustainability initiative by a major mathematical instruments company has reduced plastic waste by over 75% since 2018?

Throughout history, mathematical tools have evolved significantly, often adapting to environmental and resource constraints. This trivia question explores how the mathematics industry has embraced sustainability initiatives in tool production, balancing functionality with environmental responsibility. Test your knowledge about how mathematical instrument manufacturers are reducing their ecological footprint while continuing to serve educational and professional needs.

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Texas Instruments' recycled calculator casings made from recovered ocean plastic
Casio's solar-powered graphing calculator program that eliminated batteries
HP's bamboo-based protractor and ruler sets that replaced traditional plastic versions
Staedtler's biodegradable compass sets with plant-based plastic components