what do yo think would kill mankind first?

We ourselves...we find the lives of other people worth really less..we care about only our own needs and never see the pain or the hunger into the other...we are never content with what we have and we fight when we don't get it...life is miserable...cause we make it, not cause it is...if we make and live into this world in peace and love then this world could turn into a personal heaven....and we fight and ruin it, it could be worse than hell...Hope my answer satisfied you...Good Luck...

It is the stupidity of world governments driven by the greed of the power brokers who lead us into wars and fail to adequately address the global warming and pollution problems by always preferring to put their precious economy first and foremost, it seems that their love for the dollar stupefies them. So I would say stupid greed leaves us wide open to calamitous events that on their own or in conjunction can do the job of snuffing us out. An asteroid would be an act of mercie if we should fail.

stupidity. We will probably kill ourselves with the way we are. Most things in the world that pose as a threat to us is because we make them a threat. Global warming would be our fault, pollution will be our fault, and wars, defiantly us, asteroids is like the only one that's not our fault....but some time in the future we'll look back and see that it was our fault as well because people are special like that ha ha.

Wars and stupidity go hand-in-hand, don't they?

With the push of a button or two, we already have the capability of destroying all of mankind in a matter of minutes.

The other things you mention could destroy us too, but if it's a question of human stupidity vs. nature, I think human stupidity is more likely to occur first.

Mankind

Overpopulation. We're becoming too smart for our own good. With all the medical and technological advances that extend life, we're going to outgrow our resources in the future, unless we find some form of cold fusion or other advancement that radically increases our ability to create energy.

The greatest thing about mankind is, through time and time again, we allmost kill ourselves, but then survive. I think we're allmost to the point where nothing can kill us. Give it 50 years, and we'll have a self-sufficient moon or mars habitat, and orbital colonies, and at that point, Nothing could kill us off entirely. It might destroy the earth, but mankind will still exist, and will eventually rebuild.

I saw a science channel show talking about this.

They entered all the data of the chances of how mankind will end.

The computer said, chances are, mankind will kill itself.

Stupidity is already at it. So are all the other options. I'm voting for stupidity mixed with war and religion (nuclear war because of difference in religious beliefs).

Greed