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76 points rntn | 8 comments | | HN request time: 0.548s | source | bottom
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amarant ◴[] No.45086858[source]
Why is human fecal matter worse for the environment than animal fecal matter?

Something in our diets?

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1. SR2Z ◴[] No.45086925[source]
We are apex predators, and our shit contains the condensed toxins from all of the lower rungs on the food chain. The other extreme would be an animal like a cow, which shits basically smellier grass.

That's basically it. A human being that's only eaten plants has much less devastating poops.

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2. dmurray ◴[] No.45087200[source]
I don't think this last conclusion is true. It's really about harmful bacteria, not "toxins". Even vegetarians have a complex digestive system that can harbour pathogens. Perhaps their faeces are safer to use as manure than those from a meat-eating human, but much closer to that than to a cow.
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3. FollowingTheDao ◴[] No.45087202[source]
It is far from a certain that we are apex predators since we can survive on a largely herbivore diet.

https://en.wikipedia.org/wiki/Apex_predator#Human_trophic_le...

And "our shit contains the condensed toxins from all of the lower rungs on the food chain." lacks any credibility unless you can provide a link I have never seen.

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4. SR2Z ◴[] No.45088602[source]
I have heard that it's unusually nutrient rich - maybe not toxins, but human shit definitely causes algal blooms.
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5. aspenmayer ◴[] No.45089341[source]
> And "our shit contains the condensed toxins from all of the lower rungs on the food chain." lacks any credibility unless you can provide a link I have never seen.

I’m not who you’re asking, but I can only assume that they refer to the observed phenomenon of bioaccumulation, which was factor in the unexpected harms of pesticides such as DDT on bird populations.

That said, I don’t know of any risks to wildlife or the environment from bioaccumulated toxins solely due to human waste. If I am reaching and wildly guessing, I suppose folks who eat a lot of fish might pass more mercury in their waste? From what I understood, most toxins like that are processed by the liver and don’t get flushed out.

https://en.wikipedia.org/wiki/Bioaccumulation

6. leksak ◴[] No.45089849{3}[source]
And human urine
7. raxxorraxor ◴[] No.45092852{3}[source]
Wouldn't be the first time humans tried to use human manure as fertilizer. It always ended quite shitty (for humans).
8. IAmBroom ◴[] No.45103445{3}[source]
Dumping ANY manure into a body of water causes algal blooms. Fecal matter concentrates nutrients. This has happened with modern megafarms, when flooding overflows their manure pits.