Volunteers free fries in Sanya, south China's Hainan Province, June 6, 2018. World Oceans Day, a UN-designated day held annually on June 8, aims to arouse people's consciousness to preserve oceans on Earth. (Xinhua/Chen Wenwu)

 

Volunteers clean waste on beach in Dongshan County, southeast China's Fujian Province, Oct. 2, 2017. World Oceans Day, a UN-designated day held annually on June 8, aims to arouse people's consciousness to preserve oceans on Earth. (Xinhua/Song Weiwei)

 

Members of China's Antarctic expedition put a micro plastic collector into the sea, Nov. 19, 2017. World Oceans Day, a UN-designated day held annually on June 8, aims to arouse people's consciousness to preserve oceans on Earth. (Xinhua/Bai Guolong)

 

Cleaners clear the floating waste in the fish breeding rafts in Huangqi Township of Lianjiang County, southeast China's Fujian Province, June 6, 2017. World Oceans Day, a UN-designated day held annually on June 8, aims to arouse people's consciousness to preserve oceans on Earth. (Xinhua/Jiang Kehong)

 

China's manned submersible Jiaolong is prepared to dive in the Yap Trench in the west Pacific, June 13, 2017. World Oceans Day, a UN-designated day held annually on June 8, aims to arouse people's consciousness to preserve oceans on Earth. (Xinhua/Liu Shiping)

 

Pearl cultivators transfer shells at a pearl cultivation farm in Beihai City, south China's Guangxi Zhuang Autonomous Region, Dec. 7, 2017. World Oceans Day, a UN-designated day held annually on June 8, aims to arouse people's consciousness to preserve oceans on Earth. (Xinhua/Zhang Ailin)

 

A little girl stays at a camp in Qingdao Haichang Polar Ocean Park in Qingdao, a coastal city in east China's Shandong Province, May 19, 2018. World Oceans Day, a UN-designated day held annually on June 8, aims to arouse people's consciousness to preserve oceans on Earth. (Xinhua/Li Ziheng)

 

A seaweed harvest boat sails at a seaweed farm in Sansha Township in Xiapu County, southeast China's Fujian Province, Nov. 26, 2017. World Oceans Day, a UN-designated day held annually on June 8, aims to arouse people's consciousness to preserve oceans on Earth. (Xinhua/Jiang Kehong)

 

Photo taken on Jan. 26, 2018 shows the scenery of Xinying mangrove national wetland park in south China's Hainan Province. World Oceans Day, a UN-designated day held annually on June 8, aims to arouse people's consciousness to preserve oceans on Earth. (Xinhua/Jiang Enyu)