This always makes me smile when a JW talks about the terrible population explosion.
What they fail to realise is that people are now living longer, and in most areas there are less infant and child mortalities. Probably less dying through wars as well.
Also because of improved healthcare many couples do not have to produce loads of children these days, in the hope that one will survive and be able to look after them in their old age.
My father in law came from South America. He had 5 brothers and sisters but he was the only when who lived to old age. All the others died very young through very little decent heathcare.