Which innovative sustainable practice has most significantly reduced the carbon footprint of pharmaceutical supply chains in the last decade?

The healthcare industry generates significant waste and environmental impact through its supply chains. As sustainability becomes increasingly important in medicine, pharmaceutical companies and healthcare providers are developing innovative approaches to reduce their carbon footprint while maintaining quality care. This trivia question explores one of the groundbreaking sustainable initiatives in medical supply chain management that's changing the industry landscape.

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Temperature-controlled reusable shipping containers with IoT monitoring for cold chain medications
Complete transition to drone delivery for all hospital pharmaceuticals
Blockchain-verified carbon offset credits purchased by all major pharmaceutical manufacturers
Mandatory solar-powered manufacturing facilities for all FDA-approved medications