Seven dangers facing the earth

   The earth is facing various crises. Various natural and man-made factors are gradually changing the destiny of the earth and human beings. Experts from the United Kingdom, the United States, Austria, and Israel recently predicted the top ten dangers facing the planet and how dangerous they are.
   First, climate change,
   a senior fellow at the Tyndall Center for Climate Change Research University of East Anglia UK Nick Brooks said:
   “By the late 20th century, the concentration of greenhouse gases is likely to be doubled, at least the average global temperature will rise 2 ℃. This will be the highest temperature experienced by the earth since 1.5 million years. In the worst case, this is likely to completely change the climate in many parts of the world, possibly leading to instability of global food supply and the complete collapse of the existing social system. As some parts of the world become uninhabitable, large-scale population migration may occur, and competition for resources will become more intense. I do n’t think climate change will ring the death knell for humanity, but it does have disaster-causing effects. the power of ”
   the next 70 years the possibility of Chaoguo temperatures rise 2 ℃ (EU believes this is the dangerous level): the high
   level of danger: 6
   Second, telomere loss
   , MD, of the University of Vienna, Austria Reinhard Rustin del think, Each species has its own “evolution clock”, which ticks in the process of species replacement, The countdown to the inevitable extinction date. He says:
   “Each animal has a protective cap on the end of the chromosome, called a telomere. Without them, our chromosomes would become unstable. Each time a cell divides, it cannot fully replicate these telomeres, so in our Throughout life, telomeres become shorter and shorter as cells proliferate. Eventually, when they become very short, we begin to develop age-related diseases such as Alzheimer’s disease (also known as senile Dementia), heart disease, and stroke. However, telomeres are not shortened in a person’s lifetime. My theory is that every generation, there is a small loss in telomere length, just like the individual’s aging process. Thousands of generations have also lost telomeres to a critical level. By then, we will find that the age of onset of age-related diseases has advanced, leading to a sharp decline in population. Telomere loss can explain why a seemingly successful species ( such as Neanderthals) will suddenly disappear in the absence of external factors such as climate change situation. ”
   the next 70 years due to the loss caused by human telomeres The likelihood of the sharp reduction: Low
   Hazard Class: 8
   III virus pandemic
   professor virologist Maria Chan mbang UK, said:
   “Since the 20th century, mankind has experienced several large-scale influenza epidemic, in addition to the AIDS virus And the SARS virus epidemic. Every century, there will be severe epidemics worldwide, and the future is inevitable. The most serious problem is the outbreak of bird flu in some areas. If this virus ‘learned’ in people Spreading from person to person, then it will quickly spread throughout the world. The flu that broke out in 1918 killed 20 million people in just one year, more than those killed in World War I. Similar outbreaks now have It may have a more devastating effect.
   “Killing all hosts is not in the interest of the virus, so the virus is unlikely to destroy the entire human race, but it can cause serious regressions for many years. There is never an ideal way to deal with nature: nature is the ultimate bioterrorist. ”
   The possibility of a pandemic virus appears next 70 years: Very High
   Hazard Class: 3
   Fourth, the meteorite impact
   NASA’s Jet Propulsion California Near-Earth Object Program Office Director of the Laboratory of Donald Yeomans said:
   “for a long period of time, the risk of dying people NEO impact is roughly equivalent The risk of death in an aircraft crash. To cause a serious retrogression of our human civilization, the diameter of the impacting object must be 1.5 kilometers or larger. We predict that such an event will occur once every 1 million years on average. Such a huge impactor may The dangers include the rise of large amounts of dust in the atmosphere, blocking the sun for weeks, affecting the survival of plants and life-sustaining crops. Meteorites hitting the earth can also trigger global storms and severe acid rain. But All of these are relatively short-term impact, so the most adaptable species (cockroaches and humans, for example) are likely to survive. ”
   the next 70 years by the possibility of a large meteorite hit the Earth: medium
   hazard Class: 5
   V, cosmic rays
   Physics Israel Hebrew University of Jerusalem city Neil Shawei Fu said:
   “Every few decades, the Milky Way where we will have massive stars run out of fuel due to the explosion, which is known as a supernova cosmic rays (high-energy particles similar to gamma rays. ) Will be ejected in all directions. If the Earth happens to be within its coverage, these rays may bring the Earth into the Ice Age. If the Earth has a cold climate, then the extra cosmic ray burst will exacerbate the cold of the Earth, and may Leading to the extinction of many species. It is most at risk when the Earth passes through a spiral arm of the Milky Way (the region where supernova bursts are most frequent). This cycle is about 150 million years. Geological and climatic indicators show that the Earth is also corresponding to it The ice age occurred during this period, the ice volume at the poles increased, and there were multiple ice ages. The planet is now almost out of the Milky Way’s Sagittarius, the slewing arm of the ship’s base, and it should have a warmer climate in the next few millions years. But in about 6000 million years, the Earth will enter the Perseus arm, the cold weather is likely to dominate again. ”
   the next 70 years In case of the possibility of a supernova: Low
   Hazard Class: 4
   Six, a super volcano eruption
   Professor Bill McGuire, director of the Benfield Disaster Research Center, University College London, said:
   “Approximately every 50,000 years, the Earth will experience a super volcano eruption have more than 1,000 square feet. Kilometers of land is covered by flowing volcanic magma, the surrounding continent is filled with volcanic ash, and sulfur gas is injected into the atmosphere. In the next few years, the sun will be blocked and the day will become like a moonlight night. The extent of the damage depends on its location and the length of time the gas stays in the atmosphere. The most destructive supervolcano eruption in human history was the eruption of the Toba volcano on Sumatra, Indonesia, 74,000 years ago. The volume of the eruption reached 3200. Cubic kilometers is considered to be the largest volcanic eruption in 25 million years. The volcanic ash from this volcanic eruption made the sky dark and caused the average temperature on the earth to drop by 5 ° C for 6 years. In some parts of the north of the earth , The temperature even dropped by 15 ° C. The volcanic eruption lasted for several weeks, and half a day after the eruption. The sky is covered by volcanic ash. Malaysia ’s volcanic ash is 7 meters thick and India ’s Degan Plateau is 15 cm thick. After 4 weeks, the volcanic ash effect drastically lowered global temperatures and entered the glacial period.
   “The possibility of a supervolcano eruption 12 times the impact of a large meteorite. Its probability in our lifetime is 0.15%. What needs attention now are supervolcanoes that erupted in the past, such as the supervolcano in Yellowstone National Park in the United States and the Toba volcano on Sumatra, Indonesia. But even more worrying is that supervolcanoes may also erupt in places that have never erupted, such as in the Amazon rainforest. ”
   The next 70 years the possibility of a super volcano eruptions occur: Very High
   Hazard Class: 7
   Seven, the Earth is a black hole swallowed
   a professor of physics at Harvard University’s Richard Wilson said:
   “More than 10 years ago, when the Brookhaven National Laboratory in New York City built a relativistic heavy-ion collider, it was feared that it would create a state of dense matter like never before. At that time it was the largest model developed by humans. Particle accelerator that violently collides gold ions. The danger is that it may form a high-density region similar to a black hole state, absorbing external materials. Brookhaven National Laboratory (or even the entire Earth) will eventually not Will it be swallowed by the black hole made by this new accelerator? Using the information about the black hole in outer space we already know, we performed some calculations to understand whether the particle accelerator of Brookhaven National Laboratory can form such a black hole. Now we It is safe to say that matter in this state will not form in Brookhaven National Laboratory, and the Earth will not be swallowed when these particles collide. ”
   Possibility of the Earth being engulfed by a black hole in the next 70 years: Extreme low
   risk rating: 10