If humanity were to stop having babies, extinction could happen surprisingly quickly, according to Professor Michael Little. Although it might seem like it would take around 100 years for the population to dwindle due to aging, the potential lack of young workers to support society may cause rapid decline in 70-80 years. Shortages in essentials like food and clean water could lead to civilization's collapse. Countries with aging populations would be hit harder, but even those with younger demographics will face inevitable population decreases as generations pass.
If all of humanity suddenly lost the ability to have children, the world would not end overnight. Instead, the world's population would gradually shrink as older generations die.
Civilization would crumble within 70 or 80 years due to shortages of food, clean water, and essential supplies needed for survival.
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