There are many ways of human extinction: the ozone layer may disintegrate, exposing the earth’s surface to dangerous levels of ultraviolet radiation; super volcanoes may erupt around the world, depriving food crops of the necessary sunlight; anarchists may create a lethal, highly contagious supervirus; and an asteroid that destroys the planet class may collide Earth, obliterate all life forms on earth < / P > < p > you may think that life and human existence are priceless and therefore worth any amount of money and effort. To the extent that these events are extremely unlikely, on the other hand, to realize that these events are extremely unlikely to happen, and in fact, they are extremely unlikely to happen. < / P > < p > considering that most of us are faced with many distractions every day, we will naturally choose the latter view – believing that the probability of catastrophic events is extremely low and enjoying a life without fear and financial burden. In his book the end of the world: a brief introduction to the end of the world, published in 2019, science writer Brian Walsh argues that we must be aware of the threat of extinction, and we may need to spend a lot of money to avoid disasters. < p > < p > Walsh is particularly concerned about a potential asteroid collision with the earth, which is by far the most likely catastrophic event to cause human extinction. He pointed out that if an asteroid with a diameter of more than 5 km collides with the earth, it is likely to cause human extinction. The probability of such an asteroid colliding with the earth is very low. It is estimated that only once in 20 million years, that is to say, the probability of an asteroid colliding with the earth in any year is only 0.000005%. < / P > < p > this possibility is very low, but when you consider that the potential result is the end of mankind, you will realize the seriousness of this possibility. So how much should we spend to avoid this disaster? One way to determine how much money should be spent to avoid disaster risk is to take into account the expected cost and the probability of the risk occurring, Walsh said. We generally know the probability of asteroids colliding with the earth, so what is the cost of human extinction? According to a research report of the global challenge foundation, human civilization is expected to continue for another 50 million years, which is enough to make 300 million people born. If the average value of each person’s life is estimated to be 50000 US dollars, the monetary cost of human extinction will be US $150 billion, which is really expensive! < / P > < p > according to Walsh, this means that $750 trillion a year is needed to prevent catastrophic asteroid collisions, but the cost is nine times higher than the global economy, which is obviously an absurd figure. < / P > < p > economist Jason G. Dr. matheny presented more realistic valuation data in an analysis report in 2007. He pointed out that even if we expect human extinction within a generation, the conservation value of life invested in asteroid defense will reach US $16-32 billion annually. This will be much higher than the $22.6 billion NASA budget for fiscal year 2020, and will be dwarfed by the $150 million currently spent on Planetary Defense. Of course, human beings will also face other threats, such as the super volcano eruption in Huangshi National Park, climate change, and emerging epidemics. These events may not lead to the complete extinction of human beings, but they are likely to subvert the current human civilization. Obviously, we don’t spend enough money to prevent these catastrophes. In all the arenas, it’s almost always better to prevent negative outcomes than to live through them. However, it’s hard for human beings to realize that. < / P > < p > as Walsh pointed out, “humans are bad at assessing risks, especially potential significant risks. We rely on feelings rather than objective facts, and emotional memories take precedence over hard data.” (Ye Qingcheng)= target=_ blank>Global Tech