Kidou Senshi Gundam Eight

Earth, the third planet from the sun, was once the birthplace of humanity. Over countless years, progress in science, biology, and technology was expected to end conflict and suffering, leading to a peaceful and prosperous future. However, by the year 2030, the planet is nearly uninhabitable, with the human population reduced to just 258 survivors. Amid this dire situation, only one Gundam remains.