Photo taken on July 8, 2016 shows green algae along the seashore in Haiyang City of Yantai, east China's Shandong Province. Green algae, or enteromorpha prolifera, struck the coast of Haiyang due to wind direction and tidal current. The clear-up work is underway. (Xinhua/Zhao Jinyang)

Tourists walk across green algae mound on the seashore in Haiyang City of Yantai, east China's Shandong Province, July 8, 2016. Green algae, or enteromorpha prolifera, struck the coast of Haiyang due to wind direction and tidal current. The clear-up work is underway. (Xinhua/Zhao Jinyang)

Tourists walk across green algae mound on the seashore in Haiyang City of Yantai, east China's Shandong Province, July 8, 2016. Green algae, or enteromorpha prolifera, struck the coast of Haiyang due to wind direction and tidal current. The clear-up work is underway. (Xinhua/Zhao Jinyang)

Soldiers clear up green algae on the seashore in Haiyang City of Yantai, east China's Shandong Province, July 8, 2016. Green algae, or enteromorpha prolifera, struck the coast of Haiyang due to wind direction and tidal current. The clear-up work is underway. (Xinhua/Zhao Jinyang)

Excavators clear up green algae on the seashore in Haiyang City of Yantai, east China's Shandong Province, July 8, 2016. Green algae, or enteromorpha prolifera, struck the coast of Haiyang due to wind direction and tidal current. The clear-up work is underway. (Xinhua/Zhao Jinyang)