I take issue with Hans Rosling (even though i happen to live in Stockholm). His message is 'dont worry, they will have babies for 50 years, then it will be all

I take issue with Hans Rosling (even though i happen to live in Stockholm). His message is 'dont worry, they will have babies for 50 years, then it will be all ok'. Sub-saharan Africa will have a similar population density to south east Asia. The world will have 10 billion. That's ok. But the truth is we don't know the carrying capacity of the earth. It's deeply unpopular to say this, but the only way i can see us solving this collective action problem is with a world government.