Boats surrounded by algae in a bay in Qingdao. The bright green algae bloom is an annual phenomenon along the coastline of China's eastern Shandong province since the first outbreak in 2008, and is believed to be caused by a combination of warming sea temperatures and edible seaweed farming off the coast. Photo courtesy: AFP

Boats surrounded by algae in a bay in Qingdao. The bright green algae bloom is an annual phenomenon along the coastline of China's eastern Shandong province since the first outbreak in 2008, and is believed to be caused by a combination of warming sea temperatures and edible seaweed farming off the coast. Photo courtesy: AFP

Boats surrounded by algae in a bay in Qingdao. The bright green algae bloom is an annual phenomenon along the coastline of China's eastern Shandong province since the first outbreak in 2008, and is believed to be caused by a combination of warming sea temperatures and edible seaweed farming off the coast. Photo courtesy: AFP

People taking photos amidst algae in a bay in Qingdao. The bright green algae bloom is an annual phenomenon along the coastline of China's eastern Shandong province since the first outbreak in 2008, and is believed to be caused by a combination of warming sea temperatures and edible seaweed farming off the coast. Photo courtesy: AFP

Algae in a bay in Qingdao. The bright green algae bloom is an annual phenomenon along the coastline of China's eastern Shandong province since the first outbreak in 2008, and is believed to be caused by a combination of warming sea temperatures and edible seaweed farming off the coast. Photo courtesy: AFP

People on a beach where algae has been washed ashore in Qingdao. The bright green algae bloom is an annual phenomenon along the coastline of China's eastern Shandong province since the first outbreak in 2008, and is believed to be caused by a combination of warming sea temperatures and edible seaweed farming off the coast. Photo courtesy: AFP

A tractor shoveling up algae from a beach in Qingdao. The bright green algae bloom is an annual phenomenon along the coastline of China's eastern Shandong province since the first outbreak in 2008, and is believed to be caused by a combination of warming sea temperatures and edible seaweed farming off the coast. Photo courtesy: AFP

Ppeople walking through algae at a beach in Qingdao. The bright green algae bloom is an annual phenomenon along the coastline of China's eastern Shandong province since the first outbreak in 2008, and is believed to be caused by a combination of warming sea temperatures and edible seaweed farming off the coast. Photo courtesy: AFP