also i dont get the end of your post but here is the my answer
why will billions of people die for a few simple reason, raise in temparature = more drought irrigation problem, heatwave, desertification, spreading of hotter zone disease(malaria for example).
desertification = less forest to absorbs and retain greenhouse gas so higher rate of warming
raise in temprature = destruction of most if not all of the sea ecosystem and also the release of methane held inside ice crust at the bottom of the ocean and inside the permafrost in the northern part of Russia and Canada, also melting of the ice cap of Greenland and Antartica why worry about those two and not Artica, well for one simple Artica for the most part is ice floating on water while the two other is ice and snow on land the ansuing raise in sea level would be catastrophic for place like Bengladesh, costal China, and India and closer to us places like Florida or Louisianna forcing the displacement of millions if not billions of people
heatwave = big time detrimental to human health after three days of daytime temperature over 36C and nighttime over 26c the amount of elderly people suffering from heatstroke rises by about 17% etc,etc...
as for this been fully our fault or not and as for this been natural or not the problem does not lie there but more in the what will happen then, whe have technology and all but currently none are evolved enough and neighter do whe have nor the capacity of making them happen in the timespent that whe have left and i insist on the meaning of "time left"
also another problem that was ignored for a long time was the effect of another problem that is not often talked about and this global dimming in the early 80's when talk of global warming and air pollution arose from the dark lots and lots of manufacturer started making anti particle system for cars and vehicule thus reducing the amount of airborn particule but not greenhouse gas this made some scientific realise that the greenhouse effect whas way higher then previously tought and why is that for one simple reason the millions of tons of particule that where previously clouding the earth traped inside the cloud where no longer helping in shading the earth surface by making cloud denser thus reducing the effect of greenhouse gaz so actualy this previous pollution was keeping the effect or more precisly the rapidity of the effect of greenhouse gases effect hidden.
anyway to learn abit more about global dimming the was a good documentary made by the BBC on it, get info on it @ http://www.bbc.co.uk/sn/tvradio/prog..._summary.shtml
or wikipedia as a good text on it @ http://en.wikipedia.org/wiki/Global_dimming
edit: just saw also that the personne who posted while i was writting this as a link in its post about global dimming