[xenocyon]

> An insanely large portion of the CO2 is simply us and our livestock breathing.

That is a remarkable claim - do you have a citation?

Regarding heavy metal pollutants etc - I agree that those are a concern, but that is more or less orthogonal to the climate crisis.

[knuthsat]

This claim is not true. I mean, it's so easy to go and read withouthotair.com and see how this stuff can be calculated on the back of an envelope.

Then you can try a little bit harder and do 2nd, 3rd and other order effects and get a bit more precise estimates.

To say that a 2 ton car moving represents a tiny part of CO2 emissions and that breathing is killing the planet is ridiculous.

[zzzeek]

perhaps they are confusing CO2 for methane emitted by large fields of livestock (at the cost of their consumption of vegetation no longer available to help capture CO2) which is a non-trivial portion of greenhouse gas emission.