Back in the day when I was an MP, I warned the House of Commons that the chances of an impact by a 'Near Earth Object' - more commonly known as a comet or asteroid - are 100%. Worse still, I claimed the chance of an incoming object large enough to wipe out most, or all, of the human race is also 100%. It's just a matter of 'when.' People laughed, a lot. They thought that this was one wacky campaign too many. One paper showed a picture of me with the title MP to blame for the end of the world. But I knew my ground, as my grandfather, Ernst Öpik, was one of the world's leading astronomers on this subject.
The real latent risks to life on earth are unpredictable impacts of asteroids and eruptions of super volcanos. Both have struck the Earth in the past and there is a chance that both may threaten life again.