- 76 - 



TABLE B-3 



CO 2 COEFFICIENTS FOR CARBON- PRODUCING 

 FUELS IN THE C0 2 MODEL 



FUEL CARBON RELEASED 



(TERAGRAMS OF CARBON PER EXAJOULE) 



LIQUIDS 19.7 



GASES 13.8 



COAL 23.9 



CARBONATE ROCK (SHALE) MINING AND PROCESSING 27.9 



COAL LIQUI FACTION 18.9 



COAL GASIFICATION 26.9 



3. Slow economic growth with halved nuclear power production 

 costs produced a 1.674% annual growth in carbon emissions. 



The CC>2 emissions used for the three scenarios are depicted 

 in Figure B-4 . 

 Reasonableness of the Assumptions 



The forces that determine emission trends -- long-term 

 population, labor force, and productivity growth, changes in energy 

 supply and demand, additions to the resource base, and the inter- 

 action of these factors in a supply-demand framework -- are 

 difficult to project. For example, energy technologies could 

 change much more radically than currently foreseen. Large-scale 

 biomass production might become much more feasible in the next 

 century as an energy source if recombinant DNA and other biotech- 

 nologies produce supercrops; large fossil-fuel reserves might be 

 discovered, which would radically decrease fossil-fuels costs; 



