Why did Hawking warn people to leave the earth?

I remember Hawking's warning only made people pay attention to the current environment, resources and cutting-edge gene editing technology. He never said the following remarks: First, the sun will enter a dormant period, alien civilization will monitor human civilization, human beings will live forever in 2045, and the earth will become a fireball in 2600. Hawking has never said these rumors, so please pay attention to the distinction.

Dinosaurs that ruled the earth for nearly 200 million years died out when asteroids hit the earth. What I want to say is that even today's human beings may not do too well in the face of celestial impact; The gradual growth of the global population and the over-exploitation of the earth's resources will eventually lead to no resources available on the earth, and only the outbreak of war will directly send mankind back to the Stone Age; Super-human is a gene editing technology for human beings. We can eliminate some hereditary diseases through gene editing, but it may eventually lead to technology out of control.

Hawking strongly opposes human beings' active search for and contact with aliens. Although it seems to be an opportunity for the development of human civilization, no one can guarantee that it is not a disaster. After all, we can't judge the good and evil of extraterrestrial civilization, but we can plan according to the worst case.

Hawking's warning or not warning was once his personal opinion. Talking about these things outside his scientific research circle is similar to some science fiction novels, and there is no need to pursue scientific principles too much. For example, as long as human beings leave the earth, they will definitely happen in the future.