In 2135, Earth has long since left national borders behind, with only a single Earth Federation remaining. Technology and nature are intertwined, forming a highly complex, mutually dependent ecosystem. In this new era, people are accustomed to living alongside advanced artificial intelligence, and brain-computer interfaces have become indispensable to modern life.
However, the explosive development of technology has also brought two major problems.
First is the population boom. Earth's population has now surpassed fifteen billion. Although land reclamation can address some of the shortage of space, the planet remains overcrowded. People have no choice but to build their homes ever higher, and buildings a thousand or even two thousand meters tall are commonplace.
Second is the energy crisis. The energy generated by nuclear fission is gradually failing to meet Earth's daily needs, while humanity has yet to fully master controlled nuclear fusion. As a result, Earth is now divided into two camps. One, made up of scientists and conservatives, believes investment in controlled nuclear fusion should be increased so that humanity can achieve limitless energy as soon as possible. The other argues that rather than wasting money on a problem that has remained unsolved for over a century, Earth's population should be brought back down to its level a hundred years ago, thereby addressing at its root the series of problems caused by the energy and population crises.
