Huh? China is working on a plan for 0 population growth. In that context zero growth means the the number of young children is equal to the number of very old people. Or something like that.
Zero population growth means that parents have no more than two children. In other words, two children to replace two adults who will age and die. Thus, no increase in population. Of course, if some parents have more than two and others have less than two, it's the average that matters.
Getting off topic here, aren't we.