Morbid for Zombie Apocalypse lovers
The population of the world is 6, 894, 594, 844.
Assuming that a zombie virus was airborne, waterborne, and spread through bites and
scratches then only the few who were immune would survive.
A reasonable percentage of humans who are immune to an apocalyptic virus would be 3. 1%.
This means that 6, 894, 595 people would be immune to the virus.
This means to eliminate Every zombie each person would have to kill 999 zombies.
If each person killed one zombie per day it would take less than three years to eliminate Every
After this event was over it would take 17 generations of repopulating to bring the worlds
population back up to 6, 894, 594, 844.