Of course, many of these dangers are still quite ghostly, and some are even fantastic, but some are already near us today and no one knows when they "work" …
Colossal volcanic eruption
Today, there are about 500 active volcanoes on the planet, and among them there are those that, "working" in full force, will lead to such a giant release of sulfuric acid and ash that our earth will be covered by the so-called nuclear winter, in which only some living beings will survive, but it is unlikely they will include humanity. Such super-volcanoes are located in the USA, New Zealand, Indonesia and Japan. For example, the world famous volcano Yellowstone, during an eruption, will emit millions of tons of sulfuric acid into the Earth's atmosphere, and dust and dirt will cover the Earth in a thick layer for several decades.
Mayan predictions
You can believe in these predictions and wait for the end of the world every hundred years, you can not believe, but the fact that history is cyclical has long been proven. What appears eventually disappears and reappears, most likely in a different form, but we won't care …
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Black hole
According to the assurances of scientists in the Milky Way galaxy alone, there are about ten million black holes that crawl through the vastness of the Universe and absorb everything in their path. Who knows, maybe one of them will soon crawl to us and swallow everything, including the planet in its dark "womb" …
Asteroid collision
Another danger from space is asteroids. While they, in general, safely flew by, but who knows that there from the depths of the Universe is approaching at great speed. It can bang so that scraps will fly from us through the back streets of Space …
Rise of the robots
Although fantastic, but for today it is quite real. It is enough for one robot, already able to think, to ask the question - why I was created and why not I am the owner and that's it, the final comedy. If not the mass death of all mankind, then mass slavery is a very likely prospect.
Biotechnical (genetic engineering) disaster
Today there is a rapid development of genetic engineering. Scientists argue, but cannot come to a consensus - genetically modified products for harm or good? No one can say what a potato with a frog gene will carry, or a corn with a fish gene, etc. and how all these experiments will affect our planet in general and humanity in particular.
Massive pollution of the planet
There is even nothing to say. More of us, more food is needed, more chemicals to grow more food, more garbage from us, fewer animals, less plants (+ felling, fires, etc.), dirty rivers, dirty seas. Already today, scientists find it difficult to say what, at such a rate of pollution and destruction of their own planet, our future generations will feed and breathe.
Ice Age and Greenhouse Effect
Everyone can see the dramatic climate change. Whether it is massive warming or massive cooling - in any case - the climate is changing right before our eyes. Whether these are natural cyclical natural changes, or a reaction to human activity, it has not yet been reliably clarified. But in any case, if we do not burn out from the heat, then we will die out from the cold …
Human population development (overpopulation)
Yes, the more of us, the less of us. A person already today begins to lack resources for food and life. And what will happen if the population of the Earth increases by another, for example, half? Apocalypse - the strong kills the weak, the weak kills even weaker, etc. All, of course, are unlikely to die out, but those who remain will no longer be the same people. which we know now….
Wars
The development of weapons of mass destruction capable of destroying entire continents at one blow cannot but lead to the most sad consequences. Especially against the background of mass insanity….
Solar storms
Ejections of a powerful stream of high-energy particles caused by coronal plasma ejection from the solar corona already today lead to serious interruptions in power grids, Internet, radio, failures in electronic systems, etc. If a more powerful release occurs, then the planet will plunge into darkness, chaos, hysteria, and what all this will lead to, especially in the presence of the above weapons, is unknown.
Infections
As you know, today humanity is developing medicine, but it is because of this development that all of humanity may die. Not only are scientists finding and inventing more and more new ways to destroy their own kind with the help of new types of bacteriological weapons, but also the massive use of antibiotics kills human immunity to existing infections and the day is not far off when we can begin to die en masse from the usual colds. For example, a Canadian investment research company today made a report in which it estimated the probability of human death by 2290 at 50%. An artificially derived new strain of influenza, more dangerous than the famous Spanish flu, which killed 50 million people around the world, was named as a potential threat.
Mass madness
Another reason for the mass death of mankind, from the category of medicine, is mass insanity. Although it sounds pretty fantastic, in conditions when physical health improves and life expectancy increases, the mental state of the population, according to scientists, is deteriorating sharply. According to statistics, the number of suicides has increased in recent years, especially among the elderly. According to scientists, the human mind does not have time to adapt to the rhythm of life, to changing technologies every day, to an increase in life expectancy, medical breakthroughs in this area and to rapidly developing events in the world. If people live up to a hundred years or more, then the number of insanities cannot even be counted, although some scientists suggest that this figure will exceed 70% of the entire population of the globe.
Cancer and heart disease
Despite the really increased level of medicine, cancer is stepping on our heels. Today, scientists and doctors have noted a sharp increase in the number of diseases of this infection. And if with one type of cancer somewhere they are strenuously fighting and even winning, then the other is rapidly developing and gaining more and more new positions. The same applies to heart disease, which today is recorded in unthinkable quantities.
Undoubtedly, the fault is the ecological state of the Earth, pollution of water and air, chemicals, GMOs, etc.
Capture of the Earth by aliens
Fantastic? Yes, but to think that with the infinity of the Universe and an inconceivable number of other planets, we are the only such intelligent ones here is stupid. Who knows, maybe everything has already happened to them there, what can happen to us (the above points) and the remnants of their civilization have already set their sights on finding another, still more alive planet.