system
Given the following post, respond as if you're commenting on Reddit:
human
[Snowpiercer] Why isn't geothermal energy a solution to the problem?

Couldn't there be a geothermal powered complex that could survive in that climate?
gpt
Why do you think Wilford is telling the truth? 

All he cares about is his train. He wants his train to run forever. That is the entire extent of Wilford's hopes and dreams.

While such a severe global climate change would be catastrophic, it wouldn't doom humanity. The death toll was in the billions, but entire communities are likely thriving, kept alive by nuclear or geothermal power. Naval nuclear reactors are very reliable and can produce power for decades at a time. Even if no nuclear reactors were constructed, existing reactors could be taken from ships and installed underground in a matter of weeks. 

Governments worldwide would have instituted a crash program in constructing bunker complexes to house both the core of the government, as well as many skilled citizens as possible. Nuclear power is the most useful and practical power source. Remember, we cannot allow a mine shaft gap!

These government employees and citizens are probably watching that train roll by every year, wondering who the hell is riding a train around during a global ice age.

Then they'll shrug and go back to playing Call of Battlefield HALO 11 on their consoles, safe and secure in their nuclear powered underground lodgings, built by the esteemed Vault-Tec Corporation.