Weighted IV Change:
Weighted IV, %: reflects the potential change (%) in area-weighted
importance value (IV), first for the 5 GCM scenarios. As such, it reflects
both change in area and change in IV for the species. It is calculated
by multiplying the area of each county by the IV for that county, summing
those values across all counties, and calculating percent change from current
to GCM scenario scores.