When the Earth Returns to the Ice Age

The sudden extinction of the sun ushered in the fifth ice age in history for the 4.5 Billion-year-old earth. Politics, economy, law, culture, religion, people's livelihood, technology... Which one is the salvation in the last days? Is the origin of glaciers a punishment from the gods or the natural birth and death of the universe? Human beings who were still studying the prevention of global warming just a second ago, what should we do in such a great change?