Exxon released their updated outlook on both the demand for and sources of energy that the world will see through 2030.
Among the more encouraging parts of their outlook is the impressive contribution that efficiencies will play in the future. The chart to the left demonstrates the falling amount of energy needed for every extra dollar of economic output:
Less encouraging is the expected contributions from "alternative" sources. It seems we're spending far more money and time on these sources than their potential impact might warrant:
The whole report:
Exxon Energy Outlook