I dont understand why there is any argument on weather or not the Earth is overpopulated.It clearly is.However its overpopulated due to how we live.All I'm saying is how we choose to live and treat the Earth determines the number of humans that Earth can support.I see no reason why we couldnt support 10 billion humans AND also live in harmony with all the animals if we wanted to.But of course we havnt chose to do so.Hell we could even have a healthy Earth IF we chose too.I see no reason to be optimistic thus far for humans to be around another 1000 years.