By James C. Coomer (Eds.)

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White, M. C . S i n g e r , S . W. McKechnie, and L . E. Gilbert, "Checkerspot B u t t e r f l i e s : A Historical P e r s p e c t i v e , " S c i e n c e 188 (1975) : 2 2 1 - 2 8 . For an o v e r v i e w s e e L. L. Cavalli-Sforza and W. F. Bodmer, The G e n e t i c s of Human Populations (San F r a n ­ c i s c o : Freeman, 1 9 7 1 ) . For one v i e w , s e e R. C . L e w o n t i n , "For Apportionment of Human D i v e r s i t y , " Evolutionary Biology 4 (1967): 381-98. P . R. Ehrlich and S .

After developing a range of efficiencies for the biomass conversion, a comparison of these figures with man-made technological solar energy conversion systems can be made. 6 UNITS i \ RECOVERABLE BIOMASS ENERGY Figure 3 . 1 . SOCIETY REFLECTED BY LEAVES OR ABSORBED BY NON-LEAF SURFACES WRONG WAVELENGTHS *- 71% CHEMICAL CONVERSIONS =► 33% PLANT RESPIRATION ** ? UNRECOVERABLE PLANT PARTS ? 1 TO 3 UNITS Energy conversion process for biomass. Percent losses in r i g h t - h a n d column apply to the number of e n e r g y units available at that particular s t a g e .

A transition toward a diverse array of renewable (primar­ ily solar) energy technologies would also make rich nations much less vulnerable to interruptions of supply due to ac­ cident, terrorism, or political manipulation. Since energy plays such a fundamental role in all technological ventures, diversification of energy systems should have top priority. Another obvious area where technological diversification is desirable is transportation. Dependence on petroleum-powered vehicles - both trucks and passenger cars - must be reduced.

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