It is without doubt the case that our world is more politically unstable than at any time in my memory. Large numbers of people feel left behind both economically and socially. As a result, they are turning to populist—or at least popular—politicians who have limited experience of government and whose ability to take calm decisions in a crisis has yet to be tested. So that would imply that a Doomsday Clock should be moved closer to a critical point, as the prospect of careless or malicious forces precipitating Armageddon grows.

The Earth is under threat from so many areas that it is difficult for me to be positive. The threats are too big and too numerous.

Source: Hawking, Stephen “Brief Answers to Big Questions”. Bantam Books 2018