United Earth
From Tardis Wiki, the free Doctor Who reference
United Earth was a human government based on Earth.
It had a presidency, and emerged sometime after the war between the Oceanic States and the Asiatic States reached a stalemate in AD 2071. (AUDIO: Casualties of Time)
United Earth spacecraft used the designation "UESC." At a time when Earth was being evacuated, Gliese 581d was colonised by the United Earth Colonisation Team ship Erehwon. (TV: Smile)