What happened twenty years ago?
SCI Mystery Collection was a science fiction novel about the future world twenty years later. In this era, humans had developed highly advanced technology, but they still faced many environmental and social problems. Twenty years ago, climate change on Earth was so severe that it led to large-scale natural disasters such as tsunamis, volcanic eruptions, and tornadoes. These disasters not only caused huge casualties and property losses, but also had a huge impact on the development of human society. In addition, 20 years ago, Earth was still facing serious social problems such as the gap between the rich and the poor, racial discrimination, and political corruption. These social problems made people's lives very difficult and even led to large-scale social unrest and violence. In summary, 20 years ago, serious climate change, natural disasters, and social problems had led to the collapse and reconstruction of human society.