On July 4, 2014, global ambassadors of ecotourism from 42 countries including France, Australia, Panama, and Canada take off high-heeled shoes and ascend the Nanjing City Wall. They held the billboards to enhance the public awareness of environmental protection. (XHBY.NET/ Wan Chengpeng)

　　On July 4, 2014, global ambassadors of ecotourism from 42 countries including France, Australia, Panama, and Canada take off high-heeled shoes and ascend the Nanjing City Wall. They held the billboards to enhance the public awareness of environmental protection. (XHBY.NET/ Wan Chengpeng)

　　On July 4, 2014, global ambassadors of ecotourism from 42 countries including France, Australia, Panama, and Canada take off high-heeled shoes and ascend the Nanjing City Wall. They held the billboards to enhance the public awareness of environmental protection. (XHBY.NET/ Wan Chengpeng)