So I know the basics of terraforming (what gasses to add to get the values in the habitable range for my race, keep it in at both perihelion and aphelion, water vapor for hydro extent ect.) but how do I get specific terrain types? I want to get some varied terrain types for empire flavor but it seems I only can get steppe if the planet is in the habitable range for baseline starting race. Is there a specific thing I am missing, like to much greenhouse gasses, or not enough variety in the atmosphere, or do I need to wait for the trees and other vegetation to grow over time ect?