You have to remember, 150 years ago there was no concept of fusion power. Instead, allow me to present this scholarly article from 1862 – written by the one and only Lord Kelvin (the guy they named the unit of temperature after): On the Age of the Sun’s Heat
All things considered, there seems little probability in the hypothesis that solar radiation is at present compensated, to any appreciable degree, by heat generated by meteors falling in; and, as it can be shown that no chemical theory is tenable, it must be concluded as most probable that the sun is at present merely an incandescent liquid mass cooling.
As for the future, we may say, with equal certainty, that inhabitants of the earth can not continue to enjoy the light and heat essential to their life for many million years longer unless sources now unknown to us are prepared in the great storehouse of creation.
tl;dr the sun got all its heat ~50 million years ago from comets falling into it, and has been gradually cooling ever since.
Granted, this presumed gradual cooling of the sun is something that should take a long time to happen, but it's still a scary thought… Especially combined with the current state of the world in Frostpunk. What if the sun's dimming is permanent? How will humans survive in the future? What allows your engineers to keep going on despite knowing all of this? These are questions that will keep a man up at night.
© Post "The sun is getting dimmer? Not so outlandish a thought in the 19th Century." for game Frostpunk.
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