Deep Cold Zero

Hundreds of years in the future, after the world has been tempered by long wars, the population has dropped sharply. Now the population has reached 1.25 Billion, and the level of science and technology is seriously unscientific. Living standards have seriously declined, but technology has grown linearly. Until this day in the year 2500, the United Nations announced that an alien warship had been discovered in the solar system. Where should the future destiny of mankind go...