I'm about to achieve domination victory with the Ottomans, minimum emissions, no climate change! Will update asap.
What did I do?
1) No unit upgrades after gunpowder units
2) Powered all cities by renewables. You need about 3-4 renewable tiles for a city with full commercial, science and industrial districts..
3) do not build power plants whatsoever
4) invasion army is 3 gdr and lots of stealth bomberd
Of course this was possible by the fact that I played on settler, I doubt I could afford to go with such an obsolete and small army on higher levels.
Also out of the 9 opponent civs I had conquered all 6 just at the early modern Era so they didn't have too heavy defences for ottoman bombardier and musketman
IT appears factories without power plants do not add to climate
Spaceports do add uranium emissions!!
Very few trees, rainforest were cut maybe 4