China isn't a ravaged African country. It won't have a serious issue feeding even 3 billion people.
The Chinese Academy of Sciences estimated China has a carrying capacity of 1.7 Billion, while other researchers say it is 2.1 Billion. (
)
In fact, China's population would be 1.7 Billion in 2016 (
) without the One Child Policy, like to exceeding the CAS estimate of China's carrying capacity by 2023 today.
Do you have a citation for sustaining
3 Billion people? Do they live in mud huts or work as full-time farmers? Do they bulldoze major cities to make more room for farmland?
Sustainability is about the ratio of young working people to old non-working people.
Nobody disagreed? Who doesn't want a balanced ratio of young-old?
This is why you want fertility and longer life spans. So we can have more working people for longer.
It's a myth perpetuated by capitalist ideology to chase every increasing economic growth with an ever increasing population of laborers.
No nation can grow their population forever, and population decline is normal and cyclical through world history. So long as China is not in irreversible population decline, it's fine. The goal is eventually bottom out at 1 billion by 2050, and sustaining a young-old ratio from then onwards, which is comfortably within China's carrying capacity of 1.7 billion, while maintaining high GDP per capita.
Meanwhile, you have India with 1.8 Billion population by 2050, stuck in low-income trap, chasing that economic growth divided by youth labor, but with ever expanding life expectancy, India will eventually need a 4 billion population to take care of their 1.8 billion old people, since we all grow old right?
