Updated Sept. 5, 2006
Fossil Fuel Reserves and Resources with Annual Production Estimates

Reserves: Reserves are fuels that have already been discovered, their quantity measured, and they are known to be extractable at competitive prices.  Resources: Resources include reserves and, in addition, deposits that are inferred or expected, for which recovery is anticipated to be technically and economically feasible.  This is the quantity used to estimate fuel lifetimes.
Fossil Fuel World Reserves US Reserves World Resources US Resources
Coal (WEC*, 2000)
 27 Q
 5.4 Q
 .
 33 Q
Coal (MHC**, 1996) 20 Q 5.0 Q 150 Q 36 Q
Coal (WRI+, 1993) 48 Q 5.0 Q  150 Q 36 Q
Coal (Hubbert++ 1970) . . 198 Q .
.
 .
 .
 .
 .
Oil (MHC, 1996) 6.0 Q 0.16 Q 7.0 Q 0.45 Q
Oil (WRI 1993) 5.9 Q 0.164 Q 7.0 Q 0.45 Q
Oil (Hubbert - 1970) . . 12.1 Q .
Oil (WEC, 2000)
 5.7 Q
 0.15 Q
 .
 0.35 Q
.
 .
 .
 .
 .
Gas (WRI, 1993) 5.5 Q 0.18 Q 8.0 Q 0.70 Q
Gas (MHC, 1996) 5.4 Q 0.18 Q 8.0 Q 0.70 Q
Gas (WEC, 2000)
 5.6 Q
 0.17 Q
 .
 .
.
 .
 .
 .
 .
U-235 (WEC-2000)
 2.0 Q [< $80/kg]
 0.17 Q [< $80/kg]
 2.7 Q [< $130/kg]
 0.28 Q [< $130/kg]
U-235 (WRI, 1993)
 1.2 Q [< $80/kg]
 0.096 Q [< $80/kg]
 1.9 Q [< $130/kg]
 0.31 Q [< $130/kg]
.
 .
 .
 .
 .
Tar Sands (National Oil)
 .
 .
 2.9 Q [Canada + Venezuela]
 1.2 Q [Canada]
Methane Clathrates
 .
 .
 [Potentially large]

* WEC = World Energy Council (http://www.worldenergy.org);  + WRI = World Resources Institute (http://www.earthtrends.wri.org);
** MHC = ref in McFarland, Hunt, Campbell (Thompson Learning),  ++Hubbert = Scientific American article (1970).
[World Production 1993 = 0.338 Q/yr;  US Production 1993 = 0.093 Q/yr]

Energy Content: 
    Typical Coal at 2.6 x 1010 J/tonne = 2.6 x 107 J/kg  [varying from 1.7 to 2.9 x 107 J/kg]
    Oil at 4.2 x 1010 J/tonne,  or 5.5 x 106 Btu/bbl
    Gas at 38.8 x 106 J/m3 , 1 toe = 6000 ft3 gas
    Natural Urnaium at 8.58 x 1014 J/tonne
Recall that: [1Q = 1.055 x 1021 Joules = 1018 Btu] ,
[1 toe = 1 ton oil equivalent = 41.868 GJ],  [1 Btu = 1055 J], and [1 tonne = 106 kg]

World Production: Q/year
    Coal (from WRI, 1993)                            0.092 Q/yr  (up 40% since 1973)
    Oil (from WRI, 1993)                              0.134 Q/yr (up 36% since 1973)
    Gas (from WRI, 1993)                             0.078 Q/yr (up 72% since 1973)
    Geothermal & Wind                                 0.0015 Q/yr
    Hydro (from WRI, 1993)                         0.009 Q/yr (up 86% since 1973)
    Nuclear (from WRI, 1993)                       0.024 Q/yr ( up 1% since 1973)
                                            TOTAL          0.338 Q/yr (up 40% since 1973)

US Production: Q/year            1993 TOTAL           0.093 Q/yr