ExxonMobil's recent report The Outlook for Energy: A View to 2040 includes a forecast of changing global demographics over the next thirty years based on World Bank Estimates.

The section is highlighted by this graphic which illustrates just how large the Asian and African markets will be:

ExxonMobil

The Asia Pacific's population will be about eight times greater than the population of North America, and Africa will increase its population by nearly two times the current North America's over the next thirty years.

These regions are also currently among the least energy-intensive on the planet. And despite the massive population growth, energy demand per capita is expected to stay low: