[Balero]

The replacements for some of those poisons (large amounts of artificial fertilisers) are animal products. In a world without artificial fertiliser you need to have animals to produce fertiliser.

The optimal for this would still be much less animal farming, and a massive shift in how and where it is done. But removing all animal products would be counter productive. (Perhaps this is what you meant by plant based though).

[myshpa]

> large amounts of artificial fertilisers

Sure, but also pesti/herbicides.

> without artificial fertiliser you need to have animals to produce fertiliser

Or compost / nitrogen fixing / companion plants.

> But removing all animal products would be counter productive

There are people practicing it for decades pretty well without animal inputs.

Syntropic agriculture (Ernst Götsch), natural farming (Masanobu Fukuoka), veganic farming, permaculture, hydroponics, animal-free biodynamic farming, etc.

It's not a necessity.