According to UNICEF, the world population is expected to reach 8 billion by 2025. In less than a decade, the sustainability of the next billion will be a task for the current generation of youth to address. While middle-high income countries are experiencing low fertility rates, aging populations, and a declining workforce capable of supporting the growing dependency load, low-middle income countries are continuing to experience high fertility rates (though it is now just entering decline), and a significant youth population which is comparatively larger than the other age groups. Countries are opting to either maintain or raise their capacity for immigrants to address aging populations, a trend that is increasing all across the board.  As this is the case, labour migration is projected to continue as a major response to these demographic trends.