Which e-commerce platform was the first to require all sellers to obtain third-party sustainability certification before listing products in their 'Natural World' marketplace?

The natural products industry has seen explosive growth in dedicated e-commerce platforms over the past decade. These specialized platforms have revolutionized how consumers discover and purchase sustainable, organic, and eco-friendly products. This trivia question focuses on a pivotal moment in the development of nature-focused online marketplaces that changed how environmentally-conscious consumers shop.

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Etsy's EarthMade Program (2015)
Thrive Market's Eco-Verification System (2014)
Amazon's Climate Pledge Friendly Initiative (2020)
eBay's Eco-Hub Certification (2017)