>https://en.wikipedia.org/wiki/Doomsday_Clock

The same article points out it's not exactly objective, and I'm inclined to agree. It's more of a political (ie. subjective) statement that the world is fucked rather than an objective measure.

>Cognitive psychologist Steven Pinker harshly criticized the Doomsday Clock as a political stunt, pointing to the words of its founder that its purpose was "to preserve civilization by scaring men into rationality." He stated that it is inconsistent and not based on any objective indicators of security, using as an example its being farther from midnight in 1962 during the Cuban Missile Crisis than in the "far calmer 2007". He argued it was another example of humanity's tendency toward historical pessimism, and compared it to other predictions of self-destruction that went unfulfilled.[24]

I contend there's a lot of potentially existential threats out there, but to use it as a crutch for not having children is weak, especially when people still procreated through much worse times.