> I remember when I was younger being constantly told that the earth was destined for overpopulation. That if we didn't do things soon to curb fertility there was going to be mass starvation and death. That this was just an inevitability, a certainty unless something was done.

It is still true, but it was inaccurately presented as overpopulation, rather than excess resource consumption and entropy generation.

The mass starvation and death is not going to be a sudden nuclear bomb type event, it will be gradual decreases in quality of life due to changing environmental variables leading to changing political climates and eventually physical conflicts.