Urban Waste/Landfills

The more people there are, the more:

• littering
• air pollution (leading to acid rain)
• pavement (less natural infiltration and more surface runoff)
• salt and oil (from roads)

there are. All of those are washed to nearby rivers/streams, forming garbage patches to wherever those waterways lead to.

Toxins and microplastics leak from landfills and infiltrate into waterways, eventually making its way down a human throat, successfully poisoning the human!