Good point. Chicago was buried under a mile of ice during the last ice age. How did all that ice melt, as it all melted well before man was allegedly dumping all these pollutants into the environment???
Well, back then there was a very large group of humanoids called the Cro-Magnon Neo-Republicans who were advanced technologically, but not woke. They created huge vehicles, kind of like Hummers - but much bigger and made to drive on the ice, that ran on a carbon-based fuel that had been given to them by aliens from the planet MAGA.
You know the rest of the story..