As much as i'd love to have countries declare war on me as I kill millions of people of people via radiation and chemical bombs, could someone explain to me how contamination would play out on a map?

Would it leave a cloud of toxic gas (or radiation) that units would get hurt moving through or... what? I don't know if it's in the tutorial or not ( I didn't see the tutorial ) but I think it would benefit me and various other players to learn how they played out before we end up green.

Thanks for replying, that's all I really needed to know. Nice touch with WMD, really adds another dynamic to gameplay. Clean consistent conquering or wiping out a country side and waiting it out? I assume AI countries will declare war on you less hesitantly if you use WMD, but you can confirm or deny that after you get some sleep.