When I was younger (about 25 years ago) I was worried about overpopulation. I am embarrassed to even speak about it but we accept the reality we are trained to believe in. I had read too much of the hebephrenic squealer Paul Ehrlich who was promoted to me by a friend of mine at the time. We often find ourselves attracted to ideas that are offered to us by those we respect.
My mind has changed so radically since those days that nearly every major idea I had back then I abandoned. Do you know why? I realized these ideas were not the product of my own reasoning but notions planted into my head through social engineering.
I realize now that this planet could easily support 500 billion people, as long as those people were of the right constitution and makeup. All that gibberish I believed in when I was younger seems to me to border on religious dogma and superstitious drivel these days. I don't take it anymore seriously than my upbringing in Catholicism. For me it has come to represent the absence of good reasoning and perception, not the summit of it.
The real dilemma facing mankind is rapid and unrelenting depopulation. Good news for the haters of mankind, who lurk all about us planning to dominate a much smaller subset of people than we have alive now on the earth.