Unless the birth control is natural, it is destructive of fidelity and marriage. We have to be quite clear on this issue and not be putting our heads in the trough.

Father Bryan Storey, Tintagel, UK

Come on guys. No one is saying that we should stop having children. They are saying that it would be better for our children's future and the whole species if we have 2 rather than 8 each. Surely you would also prefer your children to live in an environment that is not about to collapse?

hugo, Amsterdam,

So let me get this straight: in order to save the planet for our children we need to stop having them! Can anyone else spot what's wrong with this statement?

Rich, Alfreton, UK

I am stunned that anyone can disagree with the idea of controlling over-population. This planet (our life support system) cannot sustain 20 billion people. If we want a world in which our children will thrive, rather than stuggle or even fight to exist, we categorically must control our population.

Hugo, Amsterdam ,

Hitler was into Eugenics as well

billy, Caerdydd, Wales

again the left makes humankind appear as s.th. un-natural.
Having kids is nature.
having kids is good.
There is nothing wrong with having kids, with kids, with being human beings.
Therte is nothing wrong at all.
It is a hoax !

Richard, Munich, Germany

Ah yes, the old people as pollution argument. It is fundamentally obscene. People are what give the world value.
A society that does not even have the self belief to reproduce itself is sick in spirit. Such a society and its precious sensitivities and values are doomed.

Chris Maddigan , Sydney, Australia

Population numbers on the planet earth is the real reason that the world has become a pollution nightmare. Any plans to reduce population levels is a must if the planet is to survive. Birth control must be practiced and enforced on world societies and quickly.

Jim Wills, Brisbane, Australia

If you want to have grandchildren then stopping at one child may not be a wise decision. Imagine that your one child has no kids. For each additional child you increase your odds of continuing your family tree and bloodline throughout further generations.

Justin Guerin, Chatham, Canada

I have been saying this for the last few years. It's all very well cutting down on packaging and finding greener fuels. However, if the population continues to grow then this is irrelevant. The more people the more food, more land and housing and resourcing for them. Simple really.

Charlie, London,

We already have too few people working to support our aging population. If we stop having children who is going to be their to take care of us when we are in our late years. We have become so advanced in so many ways we have forgotten basic survival principals. Without children there is no future.

taliah drayak, aldershot, england