*Human actions affect the health of the global oceans:

+Industrial waste: In the process of industrial production, factories continuously discharge waste into the environment. Some businesses, because they don't want to spend a lot of money on treatment, have directly discharged their wastes into surrounding rivers and lakes, leading to pollution, which significantly affects the lives of people and creatures in the area.

+ Domestic waste: Waste from daily life, plastic bags thrown into rivers, sea or sewers leads to water pollution, stinks and kills aquatic creatures. Even households in the riverside carelessly discharge other types of waste into the river such as: Leftover food; Feces; Urine;….

+Agricultural activities: In the process of growing crops, people often use pesticides, fertilizers, etc. to protect and increase crop yields. However, these chemicals contain harmful ingredients. They follow irrigation water, seep into groundwater or flow into ponds and lakes, polluting water sources.

+Due to natural factors: melting ice or floods, etc. is also a factor that causes water pollution to spread. Water caused by rain, floods carried garbage, dead organisms, sewage, etc., drifted to many places, causing pollution on a large scale.