And the overall energy pie has grown even faster, from 6 billion tons of oil equivalent (Btoe) to 11.1 Btoe.

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Natural gas has upped its share of world energy supply to one-fifth (2.3 Btoe), from one-sixth (1 Btoe) in 1973.

FORBES: It's The Consumption, Stupid

Coal, too, has increased its market share, albeit slightly, to just above a quarter, from just under in 1973, with supply rising to 2.8 BToe from 1.5 Btoe.

FORBES: It's The Consumption, Stupid

Even if the conservation measures now being considered are put in place, global energy consumption is still expected to top 14 Btoe by 2030, a 27% increase from where it is now.

FORBES: Magazine Article