epa09247098 An aerial photo made with a drone shows a fisherman in a boat on the Marmara sea covered by sea snot in Istanbul, Turkey, 04 June 2021. Because of global heating, blanket of mucus-like substance in Marmara sea increasing day by day threatens fishing industry and the environment. Sea snot is formed as a result of the proliferation of microalgae called phytoplankton in the sea. The biggest reason for this is that the water temperature in the Marmara sea is 2.5 degrees above the average of the last 40 years. EPA-EFE/ERDEM SAHIN

epa09247102 An aerial photo made with a drone shows a fishing boat sailing on the Marmara sea covered by sea snot in Istanbul, Turkey, 04 June 2021. Because of global heating, blanket of mucus-like substance in Marmara sea increasing day by day threatens fishing industry and the environment. Sea snot is formed as a result of the proliferation of microalgae called phytoplankton in the sea. The biggest reason for this is that the water temperature in the Marmara sea is 2.5 degrees above the average of the last 40 years. EPA-EFE/ERDEM SAHIN

CANAKKALE, TURKEY - JUNE 04: A view of the mucilage, which was seen on the shores of the Marmara Sea, after it started to build up in the marina with the effect of the wind in Canakkale, Turkey on June 04, 2021. The mucilage that started to fill the secluded areas of Canakkale Marina again revealed the pollution on the seabed. Ali Atmaca / Anadolu Agency/ABACAPRESS.COM

epaselect epa09247109 An aerial photo made with a drone shows fishing boats on the Marmara sea covered by sea snot in Istanbul, Turkey, 04 June 2021. Because of global heating, blanket of mucus-like substance in Marmara sea increasing day by day threatens fishing industry and the environment. Sea snot is formed as a result of the proliferation of microalgae called phytoplankton in the sea. The biggest reason for this is that the water temperature in the Marmara sea is 2.5 degrees above the average of the last 40 years. EPA-EFE/ERDEM SAHIN

epa09247107 An aerial photo made with a drone shows a man takes picture of the Marmara sea covered by sea snot in Istanbul, Turkey, 04 June 2021. Because of global heating, blanket of mucus-like substance in Marmara sea increasing day by day threatens fishing industry and the environment. Sea snot is formed as a result of the proliferation of microalgae called phytoplankton in the sea. The biggest reason for this is that the water temperature in the Marmara sea is 2.5 degrees above the average of the last 40 years. EPA-EFE/ERDEM SAHIN

CANAKKALE, TURKEY - JUNE 04: A woman rides a bicycle as she looks at the mucilage, which was seen on the shores of the Marmara Sea, after it started to build up in the marina with the effect of the wind in Canakkale, Turkey on June 04, 2021. The mucilage that started to fill the secluded areas of Canakkale Marina again revealed the pollution on the seabed. Ali Atmaca / Anadolu Agency/ABACAPRESS.COM