Which sustainability initiative has had the greatest impact on reducing the carbon footprint of religious text publishing in the past decade?

In recent years, religious publishers have faced increasing pressure to align their production practices with environmental stewardship values present in many faith traditions. This has led to significant changes in how religious texts, prayer books, and spiritual literature are produced and distributed. Test your knowledge about how the publishing side of religion and philosophy has embraced sustainability initiatives.

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Print-on-demand technology reducing overprinting and waste
Transition to plant-based inks derived from non-food agricultural products
Blockchain certification of sustainably harvested paper sources
Community-based recycling programs for outdated religious texts