Which major sustainable innovation in book publishing was first introduced by Penguin Random House in 2019, significantly reducing the industry's environmental impact?

In today's environmentally conscious world, the publishing industry has been implementing various sustainability initiatives to reduce its carbon footprint. From innovative paper sourcing to digital alternatives, publishers are reimagining how literature reaches readers while minimizing environmental impact. This poll tests your knowledge about a groundbreaking sustainable initiative in the publishing world that changed how we think about book production.

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Book Recycling Credit System - allowing readers to return used books for store credit while ensuring 100% of materials are recycled
Zero-Carbon Printing Network - the first carbon-neutral global printing operation using renewable energy across all facilities
Plantable Book Covers - biodegradable covers embedded with wildflower seeds that can be planted after reading
Digital-First Publishing Model - releasing all titles digitally for 3 months before printing physical copies based on demand metrics