Exponential
Start with two. Double it and you have four. Double it again and again and that’s sixteen. Three more times and it is one-hundred-and-twenty-eight. Four more times and it is two-thousand-and forty-eight.
Exponential growth.
Now take 7.7 billion humans and do the same.
You see, the question isn’t as simple as if we are overcrowded. it is a tangled web of when we will become overcrowded, what it will look like, what will we do in our desperation, and ultimately... if we can ever again find equilibrium.