Which sustainable practice revolutionized National Geographic's flagship atlas production in 2019, reducing its carbon footprint by over 40%?

The geography industry has been evolving rapidly to embrace sustainability practices. From digital mapping that reduces paper waste to eco-friendly materials for physical maps and atlases, geographic product development is increasingly focused on environmental responsibility. This trivia question explores an innovative sustainability initiative that changed how major map publishers approach their production processes.

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Using stone paper (calcium carbonate-based) instead of traditional wood pulp paper
Implementing AI-generated maps to eliminate field research travel emissions
Switching to exclusively digital distribution, eliminating all physical copies
Creating biodegradable ink from algae for all printed materials