What is the greatest threat to all of humanity?, if you do think its up there then put it down here. A brief summary on the listed threats. [spoiler] Ai - The rise of automation alone is going to render more and more jobs irrelevan possibly leading to economic collapse or at the very least a reformation of economics as we know them. But the rise of truly intelligent or sentient AI brings with it who knows how many pitfalls. If you have ever seen irobot, the matrix, the terminater, bladerunner or just any science fiction in general than you are probably aware of at least a dozen ways ai could turn on us. World war - Currently unlikely but not impossible. All itd take is for some super powers to get into it against each other like say US vs China and or Russia, the conflict comes to a head one way or another, one side resorts to nukes and the other retaliates culminating in boths mutually assured destruction and potentially the rest of the world too. Over population - i remember hearing years ago the earth has the resources and capacity for about 4 billion people, at the time i heard that the earths population was already estimated at around 6 billion people.. Sure we get better and better at managing our space and resorces but eventually presumably we will outstrip earths capabilites then what will we do? Space - Outer space its what killed the dinosaurs or more specifically a giant rock from outer space killed them. It could be an astroid, hostile aliens, a bad solar flare or who knows what out in the great vast void that sorrounds our tiny speck of existence thatl do us in. Disease - Disease has probably killed more people than any person, disaster or weapon but its okay because we developed Anti Biotics that will keep us safe from them forever! Unless they start becoming immune to anti biotics... Like they are... Than really any disease could kill scores of people like we havent seen in ages. Islam - Islamic terrorism is rampant but not really much a threat on its own. But what is the greater political religious ideology that spurs it on known as islam and the tidal wave of demographic change of its adherents sweeping the world. This draconian belief system is woefully misunderstood and is not simply a run of the mill religion with a few bad apples but is rather a bad tree with a few good apples. Its important to not generalize muslims but one cant ignore the inherently inhumane tenets of islam that call for the subjugation of women and the eradication and coercion of non adherents. There was a time not long ago when most people saw this cleary but now most are too afraid to appear a bigot for expressing rational fear and leaders of secular free societies invite adherents of antithetical belief en masse to never assmilate in to there own. Islam itself means to submit and with no real effort to modernize or repell it the entire world eventually could which may not be the end of humanity but could be the end of progress. Climate Change - not necessarily "man made" but the climate does change and our ability to predict how is limted much less our ability to curve it how we want. Just a little too hot or too cold and we are all -blam!-ed from no crops and or too much water and not enough land.. [/spoiler]