Sometimes it feels like, our planet is bursting at the seams with humans.
But fertility rates are actually falling in many parts of the globe. Dr Jennifer Sciubba is one of the world's leading authorities on demographic trends and the implications population rising and falling has on politics, economics, and even relationships.
She explains why the future of work, migration and peace depend on the different paths we might take to deal with a changing, and aging population.
Dr Jennifer Sciubba Photo: wilsoncentre.org
