I don't think it is sustainable. However, with climate change the earth will become muich less habitable for human life. So, in a sense the earth will take care of itself. I am not saying that is a godo outcome. I am just not surprised by the projections, considering what we are doing to the planet.

If birth rates continue to fall as they do we will probably reach a plateau at around 11 Billion. Here are some measures that can help (from wikipedia):
"Factors generally associated with decreased fertility include wealth, education, female labor participation, urban residence, intelligence, increased female age, women's rights, access to family planning services and (to a lesser degree) increased male age."
So all we need to do is support poorer countries instead of exploiting them further. When the global birth rate gets even lower than the current 2.1 children per woman we might even see a decline in the long run.

We need a cull of the ignorant and stupid...present company excluded naturally! The religious need to stop breeding, it’s frightening how they proliferate. Go forth and multiply is one aphorism from the bible that they all take literally.

These neo-Malthusian fears have always been without substance. We have been warned about this for two hundred years, and technological advances have always kept ahead of the growing populations. Here is the 1968 version of the dire population warnings. [en.wikipedia.org]

A current real problem is that women in advanced countries are not having enough children. The only exception is Israel. In the USA we have a tradition of welcoming immigrants, which helps make up for the inadequate birth rate.

It is possible that the low sunspot activity we are currently experiencing may lead to a little ice age in the next 35 years, perhaps strongly impacting agricultural production. If that comes to pass, then we might finally see the shortage of food we have been warned about for 200 years. Or perhaps human ingenuity, our greatest resource, will find a way to solve that problem too.

I couldn't agree more! The fact that we humans can so readily procreate seems like a cruel joke of nature. Does that sound cynical? Probably.

12 billion to 13 billion by 2100. How are we going to feed all of these people?

It appears the crux of world-wide problems. Purposely limited my reproduction to ‘replacements’ … only to watch the ignorant continue to bread, ‘christians’ included.. Do my best to limit consumption ..while watching others gobble it up. Fuckers indeed!

About 3.9 billion when I was born and close to ten if I live to 80. Not reproducing needs incentives. Tax breaks for getting snipped. Despite being pessimistic I don’t believe humanity will go extinct. We might drop 95% of the population or more but pockets of people will survive solely based on we’re kinda clever creatures.

The fact is 7.5 billion of anything is a plague. Eventually, the earth will correct this, most likely in the form of a global pandemic or we'll just keep breeding until our numbers can't be sustained. One way or another, we'll eventually go extinct.

Comments like that are the reason I never get offered jobs as a motivational speaker.

Maybe if we quit screwing things up in their countries, they wouldn't need escape ours. It's funny how the powers that be want freedom of movement for and stuff. But for people, it's walls and bullets.

So yeah, I think we see a crises coming ... maybe the immigration crises from hell. I mean the folks down south are going to want the stability that we in the Northern Hemisphere have. I hate the whole "wall" crap since is it is simplistic to the extreme but the truth is that immigration is coming build a fucking wall or not it is coming and we can't stop it unless we decide to become Nazi's which we can't

If you've ever been to the Southern Hemisphere you know that it is unstoppable. Believe it or not, the world is going to change and the fucking stupid wall isn't going to do jack shit.

10 Billion by 2050. Over population fuckers!!