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Edit removed the claim "EarthCheck is known to be a world leader in the field of tourism sustainability verification and certification." as linked reference was a broken link.
Additionally, this sounds more like a marketing claim than base on actual facts. EarthCheck claims on their website that "EarthCheck is the world’s leading certification, consulting and advisory group for sustainable destinations and tourism organisations." which sound rather similar. [1]
Thus, it would need more than one independent source attesting to that statement for it to be put back into the article.