Table 1.

World energy statistics and projections

QuantityDefinitionUnits2001*2050 2100
N PopulationB persons6.1459.410.4
GDPGDP § T $/yr46140 284
GDP/N Per capita GDP$/(person-yr)7,47014,85027,320
Ė/GDPEnergy intensityW/($/yr)0.2940.200.15
ĖEnergy consumption rateTW13.527.643.0
C/ECarbon intensityKgC/(W·yr)0.490.400.31
ĊCarbon emission rateGtC/yr6.5711.013.3
ĊEquivalent CO2 emission rateGtCO2/yr24.0740.348.8
  • *Ė = (403.9 Quads/yr)·(33.4 GWyr/Quad)·(10–3 TW/GW) = 13.5 TW; and Ċ = (24.072 GtCO2/yr)·(12/44 GtC/GtCO2) = 6.565 GtC (adapted from ref. 1).

  • Ė = (869 EJ/yr)·(106 TJ/EJ)/(60·60·24·365 s/yr) = 27.5 TW [adapted from ref. 2 (Scenario B2), pp. 48–55].

  • Ė = (1,357 EJ/yr)·(106 TJ/EJ)/(60·60·24·365 s/yr) = 43.0 TW [adapted from ref. 2 (Scenario B2), pp. 48–55].

  • §All in year 2000 U.S. dollars, using the inflation-adjusted conversions: $2000 = 1/0.81590 $1990 (adapted from ref. 1), and ′purchasing power parity′ exchange rates.

  • In year 2000 U.S. dollars: (113.9 T$1990)·(1/0.81590 $2000/$1990) = 139.6 T$2000.

  • In year 2000 U.S. dollars: (231.8 T$1990)·(1/0.81590 $2000/$1990) = 284.1 T$2000.