"take up" a minimum of 3.7 tons of SO7 per year. If technology were to remove
the equivalent, cost would be $550 x3.7) = $2,000 per year. If technology
was also invoked to remove the particulates, CO, NOx, and HC from automobiles,
then the cost would be about $70,000 per year. The manufacture of the material
and equipment needed to construct and operate air pollution control systems
consumes 85,000 Btu's of fuel per dollar of cost. Thus, $2,000 to $70,000
per year corresponds to the consumption of 170 to 5900 million Btu's of fuel.

12. Low dollar value represents self fertilization with organic matter at
a minimum of 11 tons per acre, replacing the need for synthetic fertilizers at
$90 per ton; total dollar savings is $990. High dollar corresponds to
construction of a soil catchment basin required to "save soil" if the vegetation
were not present. It is based on an actual catchment system constructed in a
disturbed area to collect the soil eroded until trees could be reestablished.
The fossil fuel consumed by the fertilizer industries was 130,000 Btu's for
each dollar of fertilizer produced in 1975. Conversion to Btu's uses 130,000
Btu's/$.