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green algae

$QINGDAO, CHINA - JULY 05: A general view of a public beach covered in a thick layer of green algae on July 05, 2013 in Qingdao, China. A large quantity of non-poisonous green seaweed, enteromorpha prolifera, has arrived on the coast of Qingdao and neighboring cities in Shandong province. The seaweed has grown at a rapid rate due to marine water eutrophication and warm weather. More than 40,000 tons of such seaweed has been removed from the city's beaches that causing damage to the tourism and aquatic farming. (Photo by Hong Wu/Getty Images)

Sea of green: Chinese algae beach

Huge swathes of blue-green algae have covered the beach in Qingdao, China. The bizarre sight is caused by algae called 'enteromorpha prolifera', which is non-toxic and keeps returning even though 20,000 tonnes have been removed in recent weeks.