... World consumption of coal, oil, and natural gas, 1860-1990. 12 Energy Consumption, Reserves, Depletion, and Environmental Issues 9 . . our fuels were produced millions of years ago and through ... fuels, particularly nonpolluting liquid motor fuels for large-scale worldwide distribution and clean-burning fuels for power production in stationary applications, energy and fuel shortages could ... energy consumption data for the countries in Table 1.3 and for the world's regions (U.S. Department of Energy, 1994) were used for the calculations. The factors for converting energy consumption...