Which sustainability initiative has the Oxford University Press implemented that significantly reduced their carbon footprint in dictionary production?

The language learning and linguistics industry has been evolving to embrace sustainability initiatives. From digital dictionaries replacing paper versions to eco-friendly packaging for language learning materials, companies are finding innovative ways to reduce their environmental footprint while promoting language education. Test your knowledge about how the linguistics industry is becoming more environmentally conscious and socially responsible.

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Transitioning their Oxford English Dictionary to primarily digital format, saving approximately 80,000 trees annually
Creating dictionaries from hemp paper, reducing traditional paper usage by 40%
Implementing a dictionary recycling program that repurposes 2 million books per year
Developing biodegradable ink for their printed materials, cutting toxic waste by 65%