Captain Ramen:
Sorry S but your malthusian scenario only works when there is a finite amount of resources. And how much raw material is there in the Milky Way? Or in our own asteroid belt? I would be willing to be that there is enough iron and aluminum in the belt to provide every human being on earth with at least 10 cars.

Escapist science fiction fantasy.

The human population is running up against hard stops of energy, arable lands, potable water for consumption & agricultural use, fossil fuel derived fertilizers, and scarcity of certain strategic minerals. Additionally, we have hard stops appearing in forest loss, wild lands we can claim without causing another huma-driven mass extinction event, and have clearly exceeded limits on what a Pope in the 60s stupidly called “the unlimited food harvest of the oceans that allows God to have as many children born as possible and all can be easily well-fed on the ocean’s bounty.”

Sci-Fi fantasy ignores other stars and the “boundless resources of the Milky Way” are unreachable, and getting stuff out of other solar system gravity wells or the money and energy needed for travelling to and from, then defeating the energy of angular momentum to get objects with low gravity wells potential energy needing to be cancelled(asteroids), then the energy needed to slow down and land stuff on Earth – makes the cost of getting an asteroid of solid gold (or #2 diesel fuel) back here a massive economic loss.

Eggplant is right. It looks like all the research on sustainable ecosystems and resources needed to support a human population without strain means a permanent human population of maybe 2 billion. The notion that limitless population growth automatically betters the life of each member of any living “herd” is silly, given the pattern of all living organisms is population booms, then mass die-off cycles unless the population is controlled by predators. Or internal population control measures like predators killing the spawn of rivals to limit teritorial population growth to what is the range and food the alpha wishes to have available and controlled for their own offsprings use.

Human assertions that “miracle technology” will allow limitless growth or immigration and avoid the numbers vs. resources trap other living organisms cope with are baseless.
Human history shows we are subject to the same boom and busts, since the “miracle technology” does not always show up at the last minute like the calvary in Hollywood movies.
It hasn’t happened in America, but other, longer lived nations or peoples are well aware of their die-offs or causing other’s die-offs in wars of resource ownership/ethnic cleasing to gain new territory. The times of mass famine and then disease ravaging hunger-weakened populations. Or of floods and storms killing all the people on marginal lands they were driven to by overpopulation or land controlled by the more powerful and acquisitive. No “exciting technology” saved them.

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If you go to Kenya, you see mass overbreeding has led to 40-60% unemployment, desertification, and the transformation of once livable cities (Mombasa, Nairobi) into living hells for most of their residents.

I disagree with Richard Fernandez in that the key is not being born in America, but being born in a country where the structures of government, the economy and resources permit a reasonable opportunity to each generation to work and improve their lot. Not just the spawn of the owner class and ruling elites, but all citizens.
This is not an American monopoly.
George Hussein Onyango Obama was fucked from birth by being the son of man who fucked up himself back when social mobility was still more possible when Kenya had 1/6th the people it no has. Not fucked by not being an American. If he had promise, he would have had a shot at a better life if he had begun existing in Ghana, S Africa, the Bahamas, France, UK, Antigua, Cuba, the Brazilian job-needing Cerro instead of the Sao Paul slums.

But not Kenya. Not if he was outside the privileged classes.

Same is happening in Pakistan, most of the rest of Africa, Bangladesh, and most Arab countries. High birth rates have led to breeding exceeding what the economy needs in workers and what the land can support.
Same 40-60% unemployment rates, same being fucked from birth applies to most Egyptians, Yemenis, Saudis, Paks…Which, as we learned as radical Islam has risen as a salve — can give us some real problems and dangers right here in America.
Just as mass immigration threatens many aspects of our culture, safety, energy and other resources adequacy, and future standard of living.