Which sustainability initiative holds the Guinness World Record for the largest environmental cleanup campaign by participation?

The Guinness World Records organization has recognized numerous achievements in sustainability and environmental conservation. These records not only highlight remarkable feats but also raise awareness about sustainable practices globally. Test your knowledge about world-record-setting sustainability initiatives that have made it into this prestigious record book!

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World Cleanup Day, with 18 million participants across 157 countries
The Ocean Cleanup Project, with 12 million participants across 130 countries
Earth Hour, with 15 million direct cleanup participants across 190 countries
The Great Green Wall initiative, with 11 million participants across 21 African countries