Underground cities in a Glacial Climate Transition?

My story is based on a Glacial Climate setting or an Ice Age. However the transition is gradual and humanity was given some time to adapt. The transition began in our real-world technological equivalent of Renaissance Period around the 15th century. Going by the same timeline, the story is set in 2100`s, thus it has already been in progress for 600 years.

Given that Industrial Warming has not started until the late 17th century to the early 18th century and that the process gains momentum over time, are underground cities more suitable than surface cities for progressive glacial conditions? If not, what forms of habitation are plausible?

posted over 6 years ago

System‭

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