What is the current profile of energy use in the US and the World? Can the current energy consumption profile last?

The United States' energy consumption is approximately 250 kWh/d per person and was determined from a chart provided be our professor.

The world energy consumption was a bit harder to calculate. It was first found that the energy consumption in 2008 for the world was 474 exajoules.

1 exajoule = 2.78 * 10^11 kWh
474 exajoules = 1.3167 * 10^14 kWh

Assume the population of the world in 2008 was 6.9 billion people.

(1.3167 * 10^14 / 6.9 * 10^9) / 365 days = 52.3 kWh/d per person

The current energy consumption profile in the United States and in the world can not last and will not last unless changes are made.