These raw materials, or •feedstocks, can be converted into fuels by thermochemical or biochemical processes, or can be combusted to produce steam, heat, or electricity. Biofuels currently supply 2.8 quads, or approximately 4% of US energy needs, primarily... Energy and water development appropriations for fiscal year 1989: hearings ... - Page 232 de United States. Congress. Senate. Committee on Appropriations. Subcommittee on Energy and Water Development - 1988 Affichage du livre entier -
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