What are the pros and cons of zero population growth?

Answer 1

With limited space on the earth, we need to distribute the population more proportionately with available area. And the number should be kept at the present state and for that zero population growth is very necessary. Redistribution of population by continuous movement of people from excess area to deficit area (for example: from South-east Asia to Scandinavia) along with zero growth can ensure a prosperous world, perhaps.

Answer 2

Pro
Their are almost 7 billion people now and it expected to rise to 10 billion. At some point we will run out of resources and the population will be limited by famines instead of birthrates.
Con
Cutting birth rates changes the age balance within countries where a smaller number of workers must produce for a large number of the old.