As if Air is the only was to depopulate the world …they will use each and every means possible…Slowly and surely
Surface Waters
“Municipal wastewater and industrial discharges” produce nutrients in sewage that foster excessive growth of algae and other aquatic plants. Plants then die and decay, depleting the dissolved oxygen needed by fish. Wastewater that is poorly treated may contain chemicals harmful to human and aquatic life.
“Nonpoint source pollution” consists of sediment, nutrients, pesticides, and herbicides. Sediment causes decreased light transmission through water resulting in decreased plant reproduction, interference with feeding and mating patterns, decreased viability of aquatic life, decreased recreational and commercial values, and increased drinking water costs. Nutrients promote the premature aging of lakes and estuaries. Pesticides and herbicides hinder photosynthesis in aquatic plants, affect aquatic reproduction, increase organism susceptibility to environmental stress, accumulate in fish tissues, and present a human health hazard through fish and water consumption.
Humans
Humans are not affected similarly by the presence of water pollution as they may be by the presence of polluted air. Humans are affected by water pollution through consuming contaminated water or animals (fish). Due to contaminated drinking water, lakes, and oceans, humans are inflicted with diseases, impaired blood formation, brain damage, increased blood pressure, premature birth, low birth weight, nervous system disorders, and cancer (bone, kidney, and lung).
Explanation:
Microorganisms capable of causing disease—or pathogens—usually enter our bodies through the eyes, mouth, nose, or urogenital openings, or through wounds or bites that breach the skin barrier. … Common vehicles: Contaminated food, water, blood, or other vehicles may spread pathogens.
https://ebrary.net/184192/environment/surface_waters