By understanding the reason why people have many kids to begin with: -To help you when you get old? -Because my religion says so? -My parents had many kids,

By understanding the reason why people have many kids to begin with: -To help you when you get old? -Because my religion says so? -My parents had many kids, so that seems natural It all comes down to numbers. What is the ceiling number for the carrying capacity of humans on this planet? Seems like an important question for the next 5 generations of people.