Doomsday Migration: The Seed Project and Human Origins

[Hard sci-fi. Please read with caution if that's not your thing. No power fantasy, no System, no idiocy, no school setting, no formulaic tropes, multiple protagonists] Main Storyline A: The Seed Project In the 21st century, a meteorite crashes into Earth. The violent impact and the ensuing tectonic activity fill the entire atmosphere with endless dust, plunging the planet into darkness. In this long winter, will we go extinct just like the dinosaurs? The United Nations launches the “Seed Project” to save humanity, seeking to build five space arks so we can migrate to a new home or wait for Earth's ecosystem to recover. But Countries R and C refuse to take part. They oppose the Western world dictating humanity's fate, and so a world war between East and West begins. Main Storyline B: The Origin of Humanity Darwin's theory of evolution cannot explain our origins. Humans are the only animals that walk upright. With our physical abilities and fragile skin, how did we emerge victorious from Earth's evolutionary race? Could we really have evolved from monkeys? And where did monkeys come from? No one can answer how humanity appeared on Earth. We seem more like immigrants from another planet. But all of this is about to happen again on Earth. Two apocalyptic migrations, separated by thirty thousand years, unfold like a script written in advance.