Birth control to Catholics? Hard.
Birth control to evangelicals? Easy. I'm one of them.
The thing is the various environmental challenges we face, from global warming to peak fossil fuels to peak fisheries to peak water to peak arable land to peak metals and other rare earths... basically 'peak everything' all starting in the next decade; these crisis could either cause us to fight it out over the remaining resources, or unite under various new international regimes. (EG: Kyoto might just be the beginning.)
Imagine something like the EU growing across the world as Africa forms their own USA. Imagine the governments of the world finally providing democratic stability and the ability for the citizens of the WORLD to vote on global issues. Imagine western democracies providing education, freshwater, basic nutrition and housing and healthcare and
all the basic human needs to everyone in Africa and China.
That's a recipe for a worldwide 'demographic transition'. The main ingredients for solving world overpopulation are:-
1. Meeting basic human needs (so that peasant farmers don't have 15 kids in case 10 of them die!)
2. Educating women (UN says every 3 years of female education = roughly 1 less child).
3. Some basic economic security in old age (if we guarantee peasants won't starve to death in old age, then they don't feel like having 12 labourers to work the farm and look after them in their old age.)
So... peak oil? Global Warming? Scary?
We can solve these threats in a variety of ways, but primarily by political agreements that prevent conflict over these things. Then we can get on with the "Picken's Plan" of wind power through the central USA as someone posted above.
Lastly, the reason I can campaign for population control — even as one of the infamous "Sydney Anglican's" —*is because these individual measures that make up the 'demographic transition' are worth doing in and of themselves.
For more, see my page at:
Eclipse Now: Reduce population growth