>Just a reminder that we did know about global warming. We've been knowing for a long time.
That is not really correct and very nitpicky. We also know, that volcanic activity that releases those greenhouse gases were actually cooling down planet with catastrophic consequences to humanity that halted economic development. Not to mention, that there is also observation, that cities have higher temperature than in countryside(on average 2 degrees higher in north - 4-5 degrees hotter in south), where cows are generating methane gas. The scourge of 21st century is that human infested urban environment that has constantly hotter temperature than environment around it finally have reached significant enough coverage, so that it is now affecting rest of the planet.
Also, it is worth mention that there is a theory of Nuclear Winter, which is completely avoided in Civilization games.
All the greatest scientists in late 1970s were talking about coming of a new Ice Age. All the science fiction from that era is full of Ice age related stories. So, at the moment global warming is complete bonkers theory, that will fly out of the window as soon as there will be a sufficient volcanic activity level. So far there is also observation, that volanic activity has been going down while global warming has gone up.
The current theory of Global warming is very politicized. The data that lead to this theory was fabricated and opponents to this theory were silenced. And constructive criticism about reasons why there is a global warming is not possible. It is not as much as a theory, as it is a religion with belief system for something that has different natural causes. Besides there is some belief, that there will be high temperatures in equator, that render those regions void of life, while the reality is that highest rise of temperature is going to be around poles and that in turn will improve living conditions to people that are living there now.
The main reason why there exist theory about global warming is because it was a reaction to actions of Arabic Gulf countries in 1980s that halted economy of USA by creating fuel shortage. Suddenly Ice Age theory became defunct overnight...
Though, there are of couse good side effects to this new religion - fuel powered cars are cause for lead poisoning and ending usage of them will be better to health along with other enviromental changes.
When Sid Meyer was making his game, it was not yet known, that lands that are now under ice, would be rebounding and main body of that water will flow to equator(because of planets rotation and shape) to flood things more around equator than lands that are near poles. I did not knew about that either, but I always wanted to build some city on that Earth map in first Civilization, that was turning ocean tiles into land tiles in northern pole because of a bug.