polr: Pollution Ratio
Variable
Global
Pollution Ratio []
polr = pol / pols

polr in the updating graph: ( how to read )
In nodes
pol : pollution
pols : pollution standard (pollution units)
Out nodes
brpm : birth-rate-from-pollution multiplier
drpm : death-rate-from-pollution multiplier
fpm : food-from-pollution multiplier
polat : pollution-absorption time
qlp : quality of life from pollution