Which innovative sustainability initiative was introduced by Penguin Random House in 2022 that revolutionized the industry's approach to reducing waste?

The publishing industry has been undergoing significant changes in response to environmental concerns. Major publishing houses and independent booksellers alike have been implementing various sustainability initiatives to reduce their ecological footprint while maintaining the magic of physical books. Test your knowledge about how the literary world is going green!

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The 'Green Reads' program that plants a tree for every 100 books sold
The 'Closed Loop' system that recycles unsold books into new ones without quality loss
The switch to exclusively using hemp-based paper for all hardcover editions
The introduction of biodegradable ink that disappears after 50 years to enable paper reuse