Appendix

 Calculations:

 1. This 3.6 units includes 3 units of coal consumed in the power plant boiler
 and 0.6 units consumed indirectly in constructing and operating the power plant.

 2. This represents a 1% solar input to gross production efficiency and a 50%
 gross to net production efficiency.

 3. This was 94% fossil fuel (coal, oil and gas).

 4. The solar energy component is calculated as solar insulation on the U.S.
 divided by 2000 to convert sunlight to its equivalent fossil fuel energy form.
 It assumes that all solar energy is coupled to the U.S. system creating clean
 air, water, boils, biomass, land forms and so on.

 5. Standing stock at 55,000 metric tons per km2 or 7.8 x 109 grams for the
 35 acres at 4.5 kcal/gram and 3.968 Btu/kcal is 140 x 109 Btu's. Dollar
 conversion at 70,000 Btu/$ (17,640 kcal/$) yield $2 x 106. All values divided
 by 5 using the conservative conversion to fossil fuel units, and the low end
 of the range.

 6. Values given in note 5 divided by 350 trees.

 7. Gross primary production at 16,800 kcal/m2/year or 2.38 x 109 kcal/year
 for the 35-acre park; 3.968 Btu's/kcal yields 9.44 billion Btu's; divided by
 2 to convert to its equivalent in organic matter, yields 4.7 billion Btu's.
 Dollar conversion at 70,000 Btu/$ yields $67,143. All values divided by 5
 using the conservative conversion to fossil fuel units and the low end of the
 range.

 8. Values in note 7 divided by 350 trees.

 9. Capitol Park buildings consume 22.5 x 109 Btu's of natural gas and 47,259
 kwh (5.8 x 108 Btu/th) for heating or a total of 28 x 109 Btu's. Other studies
 indicate greenbelts save a minimum of 7% of heating demand without greenbelts
 and, if well interfaced, save 25% for large commercial type buildings. Heating
 needs assumed to be 25% higher without park, or 30 to 35 x 109 Btu's for a
 savings of 2 to 7 billion Btu's. Dollar conversion at $1.80 per cubic foot
 for gas saved and 3 cents per kwh for electricity saved.

 10. Cost of sewage treatment capacity ranges from $64 to $106 per year for
 1000 gallons of capacity. Urban runoff requiring treatment in the absence of
 the park is 17.1 x 106 gallons/year (18 inches over 35 acres) for 47,000
 gallons/day capacity; 64 to 106 x 47 = 3000 to 5000 per year. Fuel consumed
 in materials for construction and manufacturing at 54,000 Btu's for each
 dollar of materials purchased, or 162 to 270 million Btu's.

 11. Cost of sulfur removal systems for industry, while highly dependent on the
 degree of sulfur removal attempted, averages about $550 per year per ton of
SO4 removed. Based on a literature survey, we estimate that Capitol Park trees