The 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 ___(1)___ from different industries. The WWF warned that harmful industrial ___(2)___ such as mining, dredging or drilling for oil are endangering the future of 114 of 229 sites. ___(3)___ factors adding to the risk include illegal logging and unsustainable water use. All of these are in addition to the damage being ___(4)___ by climate change. The WWF says the sites affected include Australia's Great Barrier Reef, the Grand Canyon National Park in the USA, and China's Sichuan Giant Panda Sanctuaries, which are home ___(5)___ more than 30 percent of the world's endangered pandas.