World Wildlife Fund (WWF) has issued a stark warning about the future of the world's natural World Heritage sites.It says half of the sites are at risk from different industries. The WWF warned that harmful industrial activities such asmining, dredging or drilling for oil are endangering the future of 114 of 229 sites. Other factors adding to the risk includeillegal logging and unsustainable water use. All of these are in addition to the damage being done by climate change. TheWWF says the sites affected include Australia's Great Barrier Reef, the Grand Canyon National Park in the USA, andChina's Sichuan Giant Panda Sanctuaries, which are home to more than 30 percent of the world's endangered pandas.The director of the UNESCO World Heritage Center said it was up to everyone to protect these sites. This is mainlybecause World Heritage is humankind's common heritage, and the responsibility for its conservation should be shared byeveryone. She welcomed government efforts at reducing what they take from the Earth. The governments and the privatesector around the world, according to her, should step up their action against harmful extractive uses.The WWF said that more than 11 million people worldwide rely on World Heritage sites for food, water, shelter,jobs and medicine, and that non-stop development could harm livelihoods as well as the environment.