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For 50 years, Paris-based UNESCO has compiled a list of World Heritage sites, significant places that are deemed worthy of protection, and is marking the milestone this week in Greece. "To protect this heritage ourselves... is to confront the consequences of climate disruption and the loss of biodiversity. It's the main threat... that we assess in a tangible way," UNESCO director Audrey Azoulay told the conference in Delphi on Thursday.
