I've seen a few with this message, I don't remember if this is one of them.Simplified version: global overpopulation is not as significant an issue as we think it is, and the steps we have taken thus far to prevent it are more effective than we realize.
Talking about the numbers, though, is to miss the real problem. Even if the population stabilized right where it is now we couldn't provide for everyone, the way they want to live.
Billions of people don't even have safe water or floors in their house. They might be willing to struggle along without out of season produce and jet travel and such. But they want electricity and transportation and medical care and such.
Tom