http://www.mnn.com/earth-matters/wilderness-resources/photos/11-ways-the-world-as-we-know-it-could-end/pandemic
http://www.discovery.com/tv-shows/curiosity/topics/20-ways-world-might-end.htm
http://www.livescience.com/36999-top-scientists-world-enders.html
http://gizmodo.com/5969688/7-ways-the-world-could-end-tomorrow
http://www.buzzfeed.com/masseffect3/10-ways-the-world-will-probably-end
http://discovermagazine.com/2010/oct/30-ways-the-world-could-end
http://www.smashinglists.com/ten-ways-the-world-will-end/2/