According to a thread on their forums, Bungie has calculated that there have been more deaths in the Halo 3 campaign than there are people living on Earth right now. Yes, we're serious. Bungie says that 6,719,996,560 characters have been killed in the Halo 3 story campaign since launch day, and the population of this planet is estimated to be 6,705,066,871. Congratulations ladies and gentleman, this is a milestone in the history of gaming. Good job soldiers, reward yourselves with some Rumble Pit with swords.
VideoGaming247: Halo 3 Campaign Kill Count Exceeds Population of Earth