mistermack, I applaud you for your concern about population growth and its high ranking as a world problem. I also applaud your optimism and your belief that it's a problem that should be addressed more widely. If it is addressed, there is a chance that some fresh and useful ideas can be generated. I regret that you were not around when I raised the matter under the theme of climate change. If it is not addressed more widely, nothing will change.
I totally agree with your recent comment "Surely the chances of it happening affect the quality of the idea. Which puts your idea at a value close to zero. I put forward various ideas, all of which are better, for that very reason. There's no reason why family planning products and advice couldn't be made available in every country in the world that has a high birth rate. The cost would be tiny, compared to the pay-off. The price of aid could also be linked to measures taken against churches that preach against contraception. Churches could easily be leaned on in any case. Just the threat of changing their tax status would have an instant effect on their behaviour.
If population growth was given just ten percent of the publicity that global warming gets, then attitudes could be changed very quickly. The world is obsessed by CO2, and is completely ignoring the real threat to the planet. It's like being led towards the guillotine, and worrying about rust on the blade."
Please accept this as a word of support for your stance, rather than a contribution to the topic.