Damage types

I am sure this is insultingly simple I have I have been trying to make a damage type that would destroy the environment, and kill the population. Here is what I have coded so far...

Damage Type Name := WMD
Description := A weapon of mass destruction.
Picture Number := 11
Cannot Penetrate Any Kind Of Shields := TRUE
Cannot Penetrate Any Kind Of Armor := TRUE
Number Of Vehicle Types := 0
Number of Shield Types := 0
Number of Armor Types := 0
Internal Damage Percent := 0
Facility Damage Percent := 100
Population Amount Killed Per Damage Point := 0.50
Crew Amount Killed Per Damage Point := 0
Is Viral Weapon := FALSE
Number Of Special Effects := 1
Special Effect 1 Type := Damage Planet Conditions
Special Effect 1 Amount := 0
Number Of Requirements := 0
Number Of Abilities := 0

But all this damage type does is hurt the planet conditions. Could you help me out?