Sorry if it wasn't clear what I was asking. How I understand the pollution->evolution flow works is like this:

1. Every tick pollution is generated by polluters.
2. Pollution is accumulated by [something].
3. Every 1000 accumulated units, the evolution factor is increased by the pollution factor ...

Is the behaviour for 1000 Pollution Units -> 1 'tick' of evolution via pollution factor hardcoded, or is there an API hook that handles it? I can't find anything explicitly about the total global pollution in the docs or base mod, but thought I'd at least double check here first before dropping a ...