That human beings are, by and large, stupid, careless slobs? https://getpocket.com/explore/item/the-secrets-being-revealed-by-ocean-garbage-patches
Essentially we dump garbage and poo into the well that's our only source of water, then we drink and eat from the well.
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@YouInMyEye Flashing on the men's handicapped toilet at work. I work retail part time, so....shoplifting. Someone stole a bunch of merch, stuffed the packaging in the toilet, and then pooped on top of it. So, this doesn't even give me pause. The majority of humans are pond scum.