Earth, also referred to as Terra, was the home planet of humans.
By the early twenty-first century, Earth was suffering from devastating climate change and pollution. While some large and overcrowded cities remained, it seemed that most areas outside of said cities were inhospitable ruins.
With the world in a dismal condition, these cities acted as save havens and pockets of human civilization, however, they quickly became overcrowded, which necessitated the settlement of Off-world colonies by the year 2018. Many who remained on the planet were encouraged to emigrate and replicants were banned from Earth following a mutiny staged by a Nexus-6 combat team. This prohibition was lifted in 2036 with the introduction of the Nexus-9.
Despite the pressure to leave Earth, many humans continued to live on the planet as of 2049. By this time, several ecosystems worldwide had collapsed and virtually all non-human life was extinct.