"Earth can support a finite number of human beings." You think the repeatedly discredited Malthusian assumption and a vague feeling that someday, somehow we'll run out of resources should be a guide for decisions?
Here's a fun one. My childhood science textbooks said the world would run out of oil by the year 2000. Several things made that extrapolation nonsense the most powerful of which is likely to be the decreasing relevance of oil as an energy source. Lots of people turn that into a happy parable about human ingenuity. I think it's more a parable about the crappy quality of human predictions about distant-future outcomes in complex systems.
I guess you can't stop making predictions but for goodness sake, we must have humility about our ability to know what the future holds.