Why does Hawking want mankind to leave the earth as soon as possible?

Hawking has suggested more than once that human beings should emigrate to other planets as soon as possible.

As we know, Hawking is a world-famous physicist and enjoys a lofty position in the world. In the research of physical science, Hawking also proposed Hawking radiation. In the field of popular science, his A Brief History of Time is one of the best-selling popular science books in the world.

People who have a certain position in a certain subject like Hawking will not easily predict or draw conclusions about the fate of mankind.

This is because the more scientific scholars, the more they will follow the scientific research data to make predictions. There is no evidence that what Hawking predicted will happen. Moreover, even if some scientists make predictions about the future, the contents of the predictions are usually very cautious. Unlike Hawking's later prediction that the earth will no longer be suitable for human survival due to global warming, the only way out is to emigrate to other planets. And then predicted that aliens would occupy the earth.

So why did Hawking make such a prediction? Is his prediction correct?

Will Hawking's prediction come true?

Hawking believes that global warming will probably be the main cause of human extinction. However, mainstream scientists do not agree with Hawking's theory. They think Hawking's prediction is more speculation than theory.

The reason is that although mankind is facing the test of global warming, the earth's environment has not yet reached the critical value. The earth's environment is controlled by many factors, such as Amazon rainforest, North American forest, Atlantic circulation, coral reefs, Arctic Circle, Greenland ice sheet, Antarctic ice sheet, permafrost and so on.

We can think of these factors as dominoes. As long as one of them changes greatly, it will inevitably lead to a series of reactions from other factors.

Some of these factors have positive feedback on global warming, such as: if the glacier area melts more, it will lead to an increase in the earth's temperature; The rising temperature of the earth will inevitably lead to the melting of glaciers.

There are also some factors that have negative feedback on global warming, such as: the more vegetation areas, the stronger the ability to transform greenhouse gases, and the colder the earth temperature will be; The lower the temperature of the earth, the more glaciers are formed, and the more solar photons can be reflected by glaciers. At this time, the earth will continue to cool down.

In addition, sunspot activity, volcanic ash, cloud thickness, etc. Will affect the long-term temperature of the earth.

So whether the earth is global warming or global cooling depends not only on the influence of human beings, but also on the influence of other factors on temperature.

Because there are too many factors involved in the earth's temperature, scientists cannot get enough data to predict the future environmental changes of the earth.

Although Hawking made a prediction, he did not provide scientific data to support the prediction. Therefore, from a scientific point of view, this prediction is untenable.

Why did Hawking make a prediction?

In fact, scientists like to make predictions very much. For example, Einstein predicted gravitational waves, Gamov and others predicted BIGBANG through Einstein's general relativity gravitational field equation, and there are the most mainstream predictions at present: dark matter and dark energy.

Behind these predictions, there is a solid theory. For example, dark matter was proposed because of the difference between scientific theory and actual observation. Specifically, the solar system rotates around the center of the Milky Way. The existing theory can calculate the autorotation speed as 160km/s, but the actual observation result is 240 km/s.

We know that if the actual speed of an object exceeds the theoretical speed, it means that the gravitational force provided by the center of the Milky Way will not drag the rotation speed of the solar system, so the solar system will be thrown out.

If the solar system is not thrown out, it means that there is another substance in the Milky Way, which provides additional gravity to support the solar system, so that the solar system is not thrown out, but honestly rotates around the center of the Milky Way.

However, we can't observe this force through electromagnetic force, so scientists predicted the existence of dark matter.

However, there is no solid theory behind Hawking's prediction, but it is more like a guess, which has attracted people's attention only because of his academic status.

Then the problem is coming. Hawking, a scientist, must know that making predictions requires data support. Why did he make these predictions?

It may be secular to say it, and he may make these predictions more out of helplessness. We know that Hawking is a patient with gradual freezing. Unable to control his body like a normal person, Hawking needs instruments and nursing staff to take care of his life. At this time, a difficult problem was placed in front of him: money.

Although he is a university professor, he can't do research in the laboratory like other scientists and make a living through project funds because of the gradual freezing of people.

Therefore, Hawking needs to earn living expenses by publishing popular science books, participating in programs or participating in interviews, so Hawking will play movies and TV series to maintain his topicality.

For example, Hawking once held a time dinner. At the end of the party, he sent invitations to all parts of the world, inviting people who traveled through time and space to come home for a party. As you can imagine, no one attended. But this party is very controversial, so it also brought him fame.

And these topics and fame have promoted the sales of books. Because of this, he can afford high medical expenses. From this perspective, Hawking's prediction is also Hawking's helpless move.