Which sustainability metric has become the standard for mathematics textbook publishers to measure and reduce their carbon footprint?

Educational mathematics tools and resources are increasingly focusing on sustainability as a key theme. Publishers and EdTech companies are developing products that not only teach mathematical concepts but also incorporate real-world sustainability data and modeling. Test your knowledge about how the mathematics product industry is measuring and promoting its environmental impact.

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The Fibonacci Carbon Index, which uses the sequence to optimize paper usage and distribution
The Book Lifecycle Assessment (BLA), which measures environmental impact from raw materials through disposal or recycling
The Pascal's Triangle Sustainability Model, which balances digital and print resource distribution
The Pythagorean Resource Theorem, which calculates the optimal ratio of recycled to virgin materials