Why is it said that everyone is equal in the face of disaster?

Space is filled with a staggering number of tiny clouds of dust, particles as small as a micron in diameter roaming around the air. They won't tear us to pieces, but if our solar system (remember that it moves in the Milky Way more like our Earth moves in the solar system) interacts with these dust clouds, maybe what we don't want to see will happen. There are theories that if this happens, the climate will change dramatically.

This could cause the Earth to freeze rapidly and usher in another ice age, or the Earth's ozone layer would be stripped away and a large number of cosmic rays would reach the Earth and kill humanity.

Serious damage to life, natural or man-made, resulting in significant harm to life. Disasters include not only natural disasters, but also man-made disasters. The two tend to permeate each other, and it is sometimes difficult to distinguish between them.

Most of the disasters brought about by nature are irresistible and can only be mitigated through prevention and resilience. Man-made disasters are caused by human negligence or deliberateness, and most of them can be prevented and stopped.

Ice age, more precisely glaciation or maximum glaciation, generally occurs on Earth every few thousand years, when the Earth is covered in ice and snow, the weather is unusually cold, the ocean area is shrinking, and life is more difficult to survive. Although humans survived the ice ages that appeared before, they were only a small fraction of the hunters. When the temperature drops to the point where most crops can't grow, will you still be able to feed 6 billion people?

Will everyone migrate to the equator to avoid being frozen to death? The worst known possibility is a "snowy Earth", a period in which the Earth's surface freezes from the poles to the equator, with only a small amount of liquid water remaining on the ocean floor.

When it comes to supernovae, if one is so close to us, it can completely wipe out humanity without even using a gamma ray blast. There is another type of radiation that, like gamma ray bursts, destroys all life, and in fact, the Ordovician-Silurian extinction event that occurred hundreds of millions of years ago may have been triggered by a nearby supernova. A star about 8,000 light-years away from Earth is clearly a candidate for the imminent occurrence of ** and killing us humans.

Worse is the extreme supernova, which is larger and more destructive. Fortunately, however, these phenomena are very rare.

Do you know how serious a supervolcano eruption can be? Bill Bryson devotes almost an entire chapter to the immense devastation of supervolcanoes in his A Brief History of Everything. In the case of the United States, for example, if there is a supervolcano erupting in its territory, the enormous energy generated by it will destroy everything within a radius of thousands of kilometers.

As a result, the entire country is covered with volcanic ash up to a depth of 6 to 20 meters. Most people in the United States, Canada, and Mexico will die as a result. This will be followed by a long winter, widespread basalt and many other terrible consequences.

We can't tell when Earth's sixth supervolcano will detonate, but the Yellowstone crater is clearly about to erupt. It could strike at any moment and destroy humanity on Earth.

The methane hydrate gun hypothesis illustrates the problem of sea level decline in a very interesting way. The theory is that when sea levels drop, methane gas-water claths buried deep in the seabed and permafrost zones release large amounts of methane into the atmosphere. Methane can be a super greenhouse gas, and once it's released, the oceans shrink faster, causing more snow and ice to melt, which in turn releases more methane, creating a vicious cycle.

Global warming will snowball and become more severe, causing a deadly domino effect.

That's right, we shouldn't always treat that tragic history with a hateful mood, which will only make us fall into a quagmire and can't extricate ourselves, in fact, we should think about how to be self-reliant, how to become strong, not to repeat the mistakes of the past, and bury that history forever in the depths of memory.