The increase in the earth's temperature, due to CO₂ emissions, heats the water and this causes its oxygen level to decrease. 
Deforestation.
The felling of forests can deplete water sources and generate organic waste that serves as a breeding ground for polluting bacteria.
Discharges of chemical products from these sectors are one of the main causes of the eutrophication of water.
Garbage and sewage discharge. The UN ensures that more than 80% of the world's wastewater that reaches the sea and rivers is untreated.
Maritime traffic.
Much of the plastic that pollutes the oceans comes from fishing boats, oil tankers and freight transport.
fuel spills.
The transport and storage of oil and its derivatives give rise to leaks that can reach water sources.
Very good information! I think that humanity should measure its actions, this could cost us our lives!!
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