You sound like a super villain. I think if we used this forum to discuss how to kill the human race the mods would not exactly be happy about it.
Please notice I dont offer any solutions. Only problems. Not worth trying.
I did propose to close a similar thread once that was more "how to" in its focus, but no. Calbears argument which is fairly sound is that even if one here proposed the technically brilliant solution, the real super villains would not be able to tell it apart from all the crappy solutions. Thus, the more solutions discussed, the better disguised the potentially effective ones become.
I am however quite concerned and take care not to offer any solutions that would not be obvious for someone actually working professionally on the subject.