Maybe the earth was not designed for 6 billion people,

Most things in the world come with specifications. But I have not located a spec sheet for Earth. Could it be the the EARTH was designed for 4 Billion people, but not 6 billion?

Of course killing off 2 billion is not an option. Maybe that is why Avian flue, Tidal Waves, etc comes along to help out in the process. without humans doing the job.