I'm still to see a ice tile became ocean due to GW in civ IV or a tundra became plains

:if it is Global warming, it should happen even before grassland became desert. Now if we call it "Global punishment for using nuclear devices" it makes more sense. Civ III polution and GW system was dull and boring, but it made much more sense that this...
As a side note: why do people, when talking about RL GW only focus on CO2? There are 3 main greenhouse effect gases, water vapour, methane and carbon dioxide and CO2 is the the least potent one. As anyone can feel on a cloudy day, water vapour is a highly efficient greenhouse gas, but I never saw anybody saying " let's reduce water vapour emmisions because of the GW" or (on methane ) "let's reduce our steak consumptions because of the GW, because cows produce more methane than all the human activities together and methane is much more powerful greenhouse gas than CO2 ".
I wonder why this happens....