Even for a country built on immigration, the continuing high rates of population growth are testing the consensus of national identity and demand a visionary approach to imagine a very different future, with a bigger, older population in a world that is bursting at the seams. Prosper or Perish explores what's at stake in getting the mix right, and reports on the realities for a new generation of global citizens whose work, lives and relationships stretch across borders and blend traditional identities.