UFOs as global risk

In this book are discussed global risks - i.e. risks that could lead to the complete extinction of mankind, - associated with the problem of UFOs. Although the author is on 90 per cent sure that the UFOs are some common phenomena, the remaining 10 percent are forced him to consider these risks seriously. In the book is suggested almost complete list of possible hypotheses explaining the nature of UFOs, including a number of new hypotheses (alien nanorobots, conspiracy of suppressed unconscious parts of self, parasites-symbionts from unknown forms of matter, bugs and viruses in the Matrix, etc.) and assessed the reliability of each of the hypotheses and the risk that relates to it. I consider several factors of global risk that may be associated with UFO (intelligence, energy, specific form of toxicity, informational effect, global power), based on observational data. The work is intended for a wide range of readers, as well as for anyone interested in existential risks.