Comment Ignored knowns (Score 1) 213
Also should be considered Black Swan events. They are not exactly unknown, but they are dismissed as risks, sometimes because not understanding them well enough. And with them, fatal combos should be counted too, global warming could take 50-100 years to go into full effect, and that is too much time, enough to get combined with, or be a factor causing, diseases, wars, ecosystem depletion and some other factors listed there.
In fact, don't know how things like a big meteorite or supervolcano (that would cause a drop of temperature) would combine with the increased greenhouse gases that are causing global warming. Odds are high that they won't cancel each other, but lead to an even more chaotical environment or more abrupt temperature drop (less visible light don't enter because dust, and infrared could be stopped high enough because co2)