Time: Starting in the summer of 2043 AD (June 21, the summer solstice).
Disaster trigger: An abnormal, covered-up solar flare burst superimposed on the earth's unknown geological/magnetic field changes, resulting in a sharp increase in the efficiency of solar radiation penetrating the atmosphere, and the global average temperature soared in a very short time (within a few weeks).
Initial manifestations: extreme high temperatures (far exceeding the upper limit of meteorological forecasts, such as 48°C becoming the norm, with peaks reaching 60°C+), unprecedented drought, global large-scale wildfires, accelerated melting of glaciers causing short-term abnormal fluctuations in sea level (subsequently causing complex changes in water levels due to high temperature evaporation), large-scale death of marine life, and collapse of global power and communication networks.
Mid-term changes: Disasters are not a constant high temperature. As the plot progresses, the "multi-stage nature" and "chain reactions" of the disaster will be revealed (such as the possible "nuclear winter" cooling after a major disaster, virus mutation, earthquakes caused by the release of crustal stress, etc.).
Science and technology level: In 2043, human science and technology has made significant progress in AI, bioengineering, materials science, and limited space exploration, but energy (especially clean, sustainable, and large-scale deployment) and technology to deal with global extreme climate are still bottlenecks. After the disaster broke out, the technological heritage of the old era (shelters, laboratories, weapons depots, and some still operational facilities) became a key point of contention.
