We've arranged a global civilization in which most crucial elements...profoundly depend on science and technology. We have also arranged things so that almost no one understands science and technology. This is a prescription for disaster. We might get away with it for a while, but sooner or later this combustible mixture of ignorance and power is going to blow up in our faces.
The most likely way for the world to be destroyed, is by accident. This is where we come in, we are computer professionals. We cause accidents.