Figure 1~14 shows estimated global amounts of fossil fuel energy resources as of Jan. 1, 1996.
Figures show how these fossil fuel resources are distributed by nation.
Can we get an estimate for this???
Figure 6~14 shows annual fossil fuel usage from 1973 - 1995 (data again are from the U.S. DOE).
Because new fossil fuel resources are still being discovered, the total amount of fossil fuel energy available on Earth is somewhat larger than the 38,000 EJ reported in the above figure. Nevertheless, this figure can be used to make two estimates of how long it will be until our fossil fuel energy resources run out.
These estimates are only crude ones. Actual rates of fossil fuel energy use in the future will be determined by many factors and will probably not follow either of the assumptions made in the above estimates. However, it is certain that the Earth's fossil fuel resources are limited, and that if we keep using them at a rate near what we do now, we will run out within a fairly short time. The exact definition of "fairly short time" is uncertain, it could be during our grandchildren's or children's lifetimes, it could even be during our own. By the time it happens, we will need to have switched to some other source (or sources) of energy.