By Alister Doyle
OSLO, April 6 (Reuters) - Industrial activity such as mining and logging threatens almost half of the world's natural World Heritage sites, from Australia's Great Barrier Reef to the Inca citadel of Machu Picchu in Peru, the WWF conservation group said on Wednesday.
It urged companies to obey U.N. appeals to declare all heritage sites "no go" areas for oil and gas exploration, mines, unsustainable timber production and over-fishing.
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A tourist rests while sitting on terraces at the Inca citadel of Machu Picchu in Cusco, Peru, in this August 12, 2015 file photo. REUTERS/Pilar Olivares[/caption]
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A large piece of coral can be seen in the lagoon located on Lady Elliot Island and 80 kilometers north-east from the town of Bundaberg in Queensland, Australia, in this June 9, 2015 file photo. REUTERS/David Gray[/caption]
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A llama is seen near the Inca citadel of Machu Picchu in Cusco, Peru, in this December 2, 2014 file photo. REUTERS/Enrique Castro-Mendivil[/caption]
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Oliver Lanyon, Senior Ranger in the Great Barrier Reef region for the Queenlsand Parks and Wildlife Service, takes photographs and notes during an inspection of the reef's condition in an area called the 'Coral Gardens' located at Lady Elliot Island and 80 kilometers north-east from the town of Bundaberg in Queensland, Australia, in this June 11, 2015 file photo. REUTERS/David Gray/Files[/caption]
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A tourist snorkels above coral in the lagoon located on Lady Elliot Island and 80 kilometers north-east from the town of Bundaberg in Queensland, Australia, in this June 9, 2015 file photo. REUTERS/David Gray[/caption]
A total of 114 World Heritage sites out of 229 worldwide that are prized for nature or a mixture of nature and culture were under threat, according to the study by WWF and Dalberg Global Development Advisors, a U.S.-based consultancy.