We humans tend to think of ourselves as special, the culmination of the evolutionary tree. But that hardly seems credible to an astronomer, aware that although our Sun formed 4.5 billion years ago, it is barely in middle age. Should we regret our eventual obsolescence or try to prevent it -- to rage, rage against the dying of the mites, as it were?
In 2014 there are more nuclear weapons than ever, but we don't really talk about them very much. Instead we talk, primarily about the possibility of human extinction due to climate change, food shortages, ocean acidification or, occasionally, super-volcanos or comet collisions. All of these things are possible, and all of them are very unlikely to cause the extinction of humanity.