Balloon guy, on Tuesday, December 20th, 2011, 9:18 AM, said:
I'm actually not too concerned about a "deadly virus" scenario.We are designed(by evolution
) to be really good at killing viruses. Also, viruses have a mathematical problem. If they are too deadly then it is very hard to spread them. They act as a simple poison. A truly dangerous virus would have to be extremely contagious, have a very long incubation time, yet somehow also be completely deadly. I'm not a virologist, but I would guess these three factors directly work against each other and are extremely rare combined. As a third factor, microbiologists seem to be fairly incompetent in general at designing stuff, so it's not like you can expect some weirdo to be able to design an earth ending virus even if they wanted to. I think a long slow collapse into primitivism or a brutally repressive regime due to resource depletion/environmental destruction is the most likely civilization ending threat.