Are you ready for this?

[dposborne]

Yeah it's scary. I'm one of those people who does not buy the "Don't worry! We'll automate the sucky jobs but then all of these non-sucky jobs will appear!" argument. Technological advances like these are mono-directional: once they happen it's a permanent change with no going back. There won't be a "horse revival" so to speak (or Pandora's Box reference for those who didn't watch the entire video in the link). This plus continued population expansion is going to cause massive global problems, maybe not in the next year or two but definitely in the next 20. I expect this to lead to a lot of political problems in the mid-21st century.

Actually most of the worlds population growth can be seen in the Sub Saharan areas of Africa and in south Asia mainly India. The big thing we are going to be worrying about in the future is the mass immigration from these areas of the world as more and more move to urbanized locations. India is once again in danger of facing greater poverty and starvation since the first "green" revolution wasn't as successful as it was in Mexico back in the 1950's. Achieving one of the Millennium Development Goals, the UN predicts that extreme poverty will be at an end by 2030. This should help these depressed areas of the world actually begin to come out of the poverty trap that they are entangled in, which should in turn increase stability throughout these regions. Hopefully by the time this happens the birth rates in these regions will be under control and more focus will have been put on infrastructure. I don't think that population expansion is going to cause massive global issues, maybe just in the countries that are out of control. The birth rate in the US is below 2 while its above 7 in Africa... we won't see many problems in our country, India along with sub Saharan Africa on the other hand will be in trouble.