I was playing my first game on Transcend, as H'minee (yeah, yeah, I know), and had the following experience.
1st pop: No worms.
*built Tree Farms*
*built Hybrid Forests*
*built Genejack Factories*
*built Robotic Assembly Plants, ecodamage starts to creep in again*
2nd pop: ~40 worms, half a dozen spore launchers, a locust or two, and an effing VOLCANO.
Presumably, Marr had been generating a ton of ecodamage in the interim. But it makes me wonder - just how are worms, sea rise (which I was never warned about and didn't notice any of) and volcanoes tied to pops? I've heard that after two pops worms start to appear, and that multiple pops in the same turn causes warming, but are there any tables of how many worms appear vs. pop number, or about when the volcanoes start erupting?
(Still can't get over Planet fighting you with volcanoes. "Heat rash" indeed. )