Dead fish lie on the ground as Ocean Rebellion activists protest against destructive industrial fishing during the UN Climate Change Conference (COP26), in Glasgow, Scotland, Britain, November 4, 2021. REUTERS/Hannah McKay 

A dead fish lies on the ground as Ocean Rebellion activists protest against destructive industrial fishing during the UN Climate Change Conference (COP26), in Glasgow, Scotland, Britain, November 4, 2021. REUTERS/Hannah McKay 

Ocean Rebellion protest against destructive industrial fishing during the UN Climate Change Conference (COP26), in Glasgow, Scotland, Britain, November 4, 2021. REUTERS/Hannah McKay 

Ocean Rebellion activists protest against destructive industrial fishing during the UN Climate Change Conference (COP26), in Glasgow, Scotland, Britain, November 4, 2021. REUTERS/Hannah McKay 

Ocean Rebellion activists protest against destructive industrial fishing during the UN Climate Change Conference (COP26), in Glasgow, Scotland, Britain, November 4, 2021. REUTERS/Hannah McKay TPX IMAGES OF THE DAY 

Ocean Rebellion protest against destructive industrial fishing during the UN Climate Change Conference (COP26), in Glasgow, Scotland, Britain, November 4, 2021. REUTERS/Hannah McKay 

Ocean Rebellion activist hold fish as she protests against destructive industrial fishing during the UN Climate Change Conference (COP26), in Glasgow, Scotland, Britain, November 4, 2021. REUTERS/Hannah McKay 

Ocean Rebellion activists protest against destructive industrial fishing during the UN Climate Change Conference (COP26), in Glasgow, Scotland, Britain, November 4, 2021. REUTERS/Hannah McKay 

Ocean Rebellion activists protest against destructive industrial fishing during the UN Climate Change Conference (COP26), in Glasgow, Scotland, Britain, November 4, 2021. REUTERS/Hannah McKay 

Ocean Rebellion activists protest against destructive industrial fishing during the UN Climate Change Conference (COP26), in Glasgow, Scotland, Britain, November 4, 2021. REUTERS/Hannah McKay 

Ocean Rebellion activists protest against destructive industrial fishing during the UN Climate Change Conference (COP26), in Glasgow, Scotland, Britain, November 4, 2021. REUTERS/Hannah McKay 

Sea-surface-cleaning vessels and barrier-laying boats clean up sea snot, a thick slimy layer of the organic matter also known as marine mucilage, which spread through the Sea of Marmara threatening marine life and the fishing industry, in Istanbul, Turkey June 15, 2021. REUTERS/Umit Bektas Pulitzer Prize finalist for Feature Photography 

Sea-surface-cleaning vessels and barrier-laying boats of Istanbul Municipality clean up the sea snot, a thick slimy layer of the organic matter also known as marine mucilage, spreading through the Sea of Marmara and posing a threat to marine life and the fishing industry, in Istanbul, Turkey June 15, 2021. Picture taken with a drone. REUTERS/Umit Bektas/File Photo TPX IMAGES OF THE DAY SEARCH "GLOBAL POY" FOR THIS STORY. SEARCH "REUTERS POY" FOR ALL BEST OF 2021 PACKAGES. 

Sea-surface-cleaning vessels and barrier-laying boats of Istanbul Municipality clean up the sea snot, a thick slimy layer of the organic matter also known as marine mucilage, spreading through the Sea of Marmara and posing a threat to marine life and the fishing industry, in Istanbul, Turkey June 15, 2021. Picture taken with a drone. REUTERS/Umit Bektas 

Boats are anchored on the shore as they are surrounded by sea snot, a thick slimy layer of the organic matter also known as marine mucilage, spreading through the Sea of Marmara and posing a threat to marine life and the fishing industry, in Istanbul, Turkey June 15, 2021. Picture taken with a drone. REUTERS/Umit Bektas 

Boats are anchored on the shore as they are surrounded by sea snot, a thick slimy layer of the organic matter also known as marine mucilage, spreading through the Sea of Marmara and posing a threat to marine life and the fishing industry, in Istanbul, Turkey June 15, 2021. Picture taken with a drone. REUTERS/Umit Bektas 

Sea-surface-cleaning vessels and barrier-laying boats of Istanbul Municipality clean up the sea snot, a thick slimy layer of the organic matter also known as marine mucilage, spreading through the Sea of Marmara and posing a threat to marine life and the fishing industry, in Istanbul, Turkey June 15, 2021. Picture taken with a drone. REUTERS/Umit Bektas TPX IMAGES OF THE DAY 

Sea-surface-cleaning vessels and barrier-laying boats of Istanbul Municipality clean up the sea snot, a thick slimy layer of the organic matter also known as marine mucilage, spreading through the Sea of Marmara and posing a threat to marine life and the fishing industry, in Istanbul, Turkey June 15, 2021. Picture taken with a drone. REUTERS/Umit Bektas 

Sea-surface-cleaning vessels and barrier-laying boats of Istanbul Municipality clean up the sea snot, a thick slimy layer of the organic matter also known as marine mucilage, spreading through the Sea of Marmara and posing a threat to marine life and the fishing industry, in Istanbul, Turkey June 15, 2021. Picture taken with a drone. REUTERS/Umit Bektas 

Sea-surface-cleaning vessels and barrier-laying boats of Istanbul Municipality clean up the sea snot, a thick slimy layer of the organic matter also known as marine mucilage, spreading through the Sea of Marmara and posing a threat to marine life and the fishing industry, in Istanbul, Turkey June 15, 2021. Picture taken with a drone. REUTERS/Umit Bektas 

Sea-surface-cleaning vessels and barrier-laying boats of Istanbul Municipality clean up the sea snot, a thick slimy layer of the organic matter also known as marine mucilage, spreading through the Sea of Marmara and posing a threat to marine life and the fishing industry, in Istanbul, Turkey June 15, 2021. Picture taken with a drone. REUTERS/Umit Bektas 

Aerial view of boats of the Optimist and Laser international classes competing during a race as the sea is partly covered by sea snot, a thick slimy layer of the organic matter also known as marine mucilage, spreading through the Sea of Marmara and posing a threat to marine life and the fishing industry, in Istanbul, Turkey June 13, 2021. Picture taken with a drone. REUTERS/Umit Bektas 

Aerial view of boats of the Optimist and Laser international classes competing during a race as the sea is partly covered by sea snot, a thick slimy layer of the organic matter also known as marine mucilage, spreading through the Sea of Marmara and posing a threat to marine life and the fishing industry, in Istanbul, Turkey June 13, 2021. Picture taken with a drone. REUTERS/Umit Bektas 

Aerial view of boats docked to a marina covered by sea snot, a thick slimy layer of the organic matter also known as marine mucilage, spreading through the Sea of Marmara and posing a threat to marine life and the fishing industry, in Istanbul, Turkey June 13, 2021. Picture taken with a drone. REUTERS/Umit Bektas 

An aerial view of children sailing on single-handed dinghy boats of the Optimist international class during a training session as the sea is covered by sea snot, a thick slimy layer of the organic matter also known as marine mucilage, spreading through the Sea of Marmara and posing a threat to marine life and the fishing industry, in Istanbul, Turkey June 13, 2021. Picture taken with a drone. REUTERS/Umit Bektas 

Aerial view of children sailing on single-handed dinghy boats of the Optimist international class during a training session as the sea is covered by sea snot, a thick slimy layer of the organic matter also known as marine mucilage, spreading through the Sea of Marmara and posing a threat to marine life and the fishing industry, in Istanbul, Turkey June 13, 2021. Picture taken with a drone. REUTERS/Umit Bektas 

Aerial view of a child sailing on a single-handed dinghy boat of the Optimist international class during a training session as the sea covered by sea snot, a thick slimy layer of the organic matter also known as marine mucilage, spreading through the Sea of Marmara and posing a threat to marine life and the fishing industry, in Istanbul, Turkey June 13, 2021. Picture taken with a drone. REUTERS/Umit Bektas 

Aerial view of women and their children swimming in the sea covered by sea snot, a thick slimy layer of the organic matter also known as marine mucilage, spreading through the Sea of Marmara and posing a threat to marine life and the fishing industry, on the shores of Istanbul, Turkey June 12, 2021. Picture taken with a drone. REUTERS/Umit Bektas 

Aerial view of an almost deserted beach and sea snot, a thick slimy layer of the organic matter also known as marine mucilage, spreading through the Sea of Marmara and posing a threat to marine life and the fishing industry, on the shores of Istanbul, Turkey June 12, 2021. Picture taken with a drone. REUTERS/Umit Bektas 

Aerial view of an almost deserted beach and sea snot, a thick slimy layer of the organic matter also known as marine mucilage, spreading through the Sea of Marmara and posing a threat to marine life and the fishing industry, on the shores of Istanbul, Turkey June 12, 2021. Picture taken with a drone. REUTERS/Umit Bektas 

Aerial view of a deserted beach and sea snot, a thick slimy layer of the organic matter also known as marine mucilage, spreading through the Sea of Marmara and posing a threat to marine life and the fishing industry, on the shores of Istanbul, Turkey June 12, 2021. Picture taken with a drone. REUTERS/Umit Bektas 

Aerial view of an almost deserted beach and sea snot, a thick slimy layer of the organic matter also known as marine mucilage, spreading through the Sea of Marmara and posing a threat to marine life and the fishing industry, on the shores of Istanbul, Turkey June 12, 2021. Picture taken with a drone. REUTERS/Umit Bektas 

Aerial view of an almost deserted beach and sea snot, a thick slimy layer of the organic matter also known as marine mucilage, spreading through the Sea of Marmara and posing a threat to marine life and the fishing industry, on the shores of Istanbul, Turkey June 12, 2021. Picture taken with a drone. REUTERS/Umit Bektas TPX IMAGES OF THE DAY 

Aerial view of people swimming as the sea is covered by sea snot, a thick slimy layer of the organic matter also known as marine mucilage, spreading through the Sea of Marmara and posing a threat to marine life and the fishing industry, on the shores of Istanbul, Turkey June 12, 2021. Picture taken with a drone. REUTERS/Umit Bektas 

Aerial view of people swimming as the sea is covered by sea snot, a thick slimy layer of the organic matter also known as marine mucilage, spreading through the Sea of Marmara and posing a threat to marine life and the fishing industry, on the shores of Istanbul, Turkey June 12, 2021. Picture taken with a drone. REUTERS/Umit Bektas 

Aerial view of sea snot, a thick slimy layer of the organic matter also known as marine mucilage, spreading through the Sea of Marmara and posing a threat to marine life and the fishing industry, on the shores of Istanbul, Turkey June 12, 2021. Picture taken with a drone. REUTERS/Umit Bektas 

Aerial view of sea snot, a thick slimy layer of the organic matter also known as marine mucilage, spreading through the Sea of Marmara and posing a threat to marine life and the fishing industry, on the shores of Istanbul, Turkey June 12, 2021. Picture taken with a drone. REUTERS/Umit Bektas 

Aerial view of sea snot, a thick slimy layer of the organic matter also known as marine mucilage, spreading through the Sea of Marmara and posing a threat to marine life and the fishing industry, on the shores of Istanbul, Turkey June 12, 2021. Picture taken with a drone. REUTERS/Umit Bektas 

Aerial view of sea snot, a thick slimy layer of the organic matter also known as marine mucilage, spreading through the Sea of Marmara and posing a threat to marine life and the fishing industry, on the shores of Istanbul, Turkey June 12, 2021. Picture taken with a drone. REUTERS/Umit Bektas 

Aerial view of sea snot, a thick slimy layer of the organic matter also known as marine mucilage, spreading through the Sea of Marmara and posing a threat to marine life and the fishing industry, on the shores of Istanbul, Turkey June 12, 2021. Picture taken with a drone. REUTERS/Umit Bektas 

Aerial view of sea snot, a thick slimy layer of the organic matter also known as marine mucilage, spreading through the Sea of Marmara and posing a threat to marine life and the fishing industry, on the shores of Istanbul, Turkey June 12, 2021. Picture taken with a drone. REUTERS/Umit Bektas 

Aerial view of a ferry sailing through sea snot, a thick slimy layer of the organic matter also known as marine mucilage, spreading through the Sea of Marmara and posing a threat to marine life and the fishing industry, on the shores of Istanbul, Turkey June 12, 2021. Picture taken with a drone. REUTERS/Umit Bektas 

Aerial view of a ferry sailing through sea snot, a thick slimy layer of the organic matter also known as marine mucilage, spreading through the Sea of Marmara and posing a threat to marine life and the fishing industry, on the shores of Istanbul, Turkey June 12, 2021. Picture taken with a drone. REUTERS/Umit Bektas 

Aerial view of a woman swimming in the middile of sea snot, a thick slimy layer of the organic matter, also known as marine mucilage, spreading through the Sea of Marmara and posing a threat to marine life and the fishing industry, on the shores of Istanbul, Turkey June 12, 2021. Picture taken with a drone. REUTERS/Umit Bektas 

Aerial view of a woman swimming in the middile of sea snot, a thick slimy layer of the organic matter, also known as marine mucilage, spreading through the Sea of Marmara and posing a threat to marine life and the fishing industry, on the shores of Istanbul, Turkey June 12, 2021. Picture taken with a drone. REUTERS/Umit Bektas 

A commercial vessel sails through Marmara Sea covered by sea snot, a thick slimy layer of the organic matter also known as marine mucilage, spreading through the Sea of Marmara and posing a threat to marine life and the fishing industry, in Istanbul, Turkey June 12, 2021. REUTERS/Umit Bektas 

Women and their children swim as they are surrounded by sea snot, a thick slimy layer of the organic matter also known as marine mucilage, spreading through the Sea of Marmara and posing a threat to marine life and the fishing industry, on the shores of Istanbul, Turkey June 12, 2021. REUTERS/Umit Bektas 

A beach is seen almost deserted as the sea is covered by sea snot, a thick slimy layer of the organic matter also known as marine mucilage, spreading through the Sea of Marmara and posing a threat to marine life and the fishing industry, on the shores of Istanbul, Turkey June 12, 2021. REUTERS/Umit Bektas 

Aerial view of 'sea snot', a thick slimy layer of the organic matter also known as marine mucilage, spreading through the Sea of Marmara and posing a threat to marine life and the fishing industry, on the shores of Istanbul, Turkey June 8, 2021. Picture taken with a drone. REUTERS/Mehmet Caliskan 

Aerial view of cleaning vessels and boats sailing through the sea covered with a plague of sea snot, a thick slimy layer of the organic matter also known as marine mucilage, spreading through the Sea of Marmara and posing a threat to marine life and the fishing industry, on the shores of Istanbul, Turkey June 8, 2021. Picture taken with a drone. REUTERS/Mehmet Caliskan 

Aerial view of 'sea snot', a thick slimy layer of the organic matter also known as marine mucilage, spreading through the Sea of Marmara and posing a threat to marine life and the fishing industry, on the shores of Istanbul, Turkey June 8, 2021. Picture taken with a drone. REUTERS/Mehmet Caliskan TPX IMAGES OF THE DAY 

Environment and Urbanisation Minister Murat Kurum and Mayor of Istanbul Ekrem Imamoglu speak during a gathering to give a start to the cleaning of the sea covered with a plague of sea snot, a thick slimy layer of the organic matter also known as marine mucilage, spread through the Sea of Marmara and which poses a threat to marine life and the fishing industry, on the shores of Istanbul, Turkey June 8, 2021. REUTERS/Dilara Senkaya 

Diver and filmmaker Tahsin Ceylan swims to inspect the sea covered with a plague of sea snot, a thick slimy layer of the organic matter, also known as marine mucilage, spread through the Sea of Marmara and which poses a threat to marine life and the fishing industry, on the shores of Istanbul, Turkey June 8, 2021. REUTERS/Umit Bektas 

Istanbul Mayor Ekrem Imamoglu speaks during a gathering to give a start to the cleaning of the sea covered with a plague of sea snot, a thick slimy layer of the organic matter, also known as marine mucilage, spread through the Sea of Marmara and which poses a threat to marine life and the fishing industry, on the shores of Istanbul, Turkey June 8, 2021. REUTERS/Umit Bektas 

Diver Mehtap Akbas Ciftci swims to inspect the sea covered with a plague of sea snot, a thick slimy layer of the organic matter, also known as marine mucilage, spread through the Sea of Marmara and which poses a threat to marine life and the fishing industry, on the shores of Istanbul, Turkey June 8, 2021. REUTERS/Umit Bektas 

Diver and filmmaker Tahsin Ceylan and diver Mehtap Akbas Ciftci swim to inspect the sea covered with a plague of sea snot, a thick slimy layer of the organic matter, also known as marine mucilage, spread through the Sea of Marmara and which poses a threat to marine life and the fishing industry, on the shores of Istanbul, Turkey June 8, 2021. REUTERS/Umit Bektas TPX IMAGES OF THE DAY 

Diver Mehtap Akbas Ciftci swims to inspect the sea covered with a plague of sea snot, a thick slimy layer of the organic matter, also known as marine mucilage, spread through the Sea of Marmara and which poses a threat to marine life and the fishing industry, on the shores of Istanbul, Turkey June 8, 2021. REUTERS/Umit Bektas 

A man sprays tap water to diver and filmmaker Tahsin Ceylan after he dived to inspect the sea covered with a plague of sea snot, a thick slimy layer of the organic matter, also known as marine mucilage, spread through the Sea of Marmara and which poses a threat to marine life and the fishing industry, on the shores of Istanbul, Turkey June 8, 2021. REUTERS/Umit Bektas 

A worker cleans plague of sea snot, a thick slimy layer of the organic matter, also known as marine mucilage, spread through the Sea of Marmara and which poses a threat to marine life and the fishing industry, on the shores of Istanbul, Turkey June 8, 2021. REUTERS/Umit Bektas