Word: nonfossil
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...known nonfossil energy sources, only two are far enough along in their development to be counted on: solar and nuclear, neither of which generates any greenhouse gases at all. Solar power is especially attractive. It produces no waste, and it is inexhaustible. Not all solar power comes directly from the sun: both wind and hydroelectric power are solar, since wind is created by the sun's uneven warming of the atmosphere and since the water / that collects behind dams was originally rain, which in turn was water vapor evaporated by solar heating...
...will probably have about doubled its present energy consumption. Domestic oil and natural gas, which today account for two-thirds of the nation's energy, will be able to meet only 40% of demand. Nuclear, hydro, solar, geothermal and other nonfossil fuel sources will take care of another 20%. To fill the remaining 40% gap, the nation faces two likely choices. It can import much more oil and gas-and pay heavily in terms both of balance of payments and political dependence on foreign countries. Or it can turn to coal, which now provides 20% of U.S. energy...