Models in Miscellaneous

p =.3% to 3% // Percentage
pop = 2M to 16M // Species population
a = 1/(0.2 to 0.3125) // index -- typically 0.25 is used, ie. f^0.25 of species live in fraction 0.5 of the habitat.
total_area = 10M to 15M // global rainforest area in sqkm
fraction = (1-(1-p)^a)/(p*pop) // fraction of forest that must be destroyed to extinct one species
area_per_extinction = total_area * fraction // in sqkm